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Defender Daily Hub

Microsoft Defender and security blog — threat intelligence, new features and security alerts.

Updated daily · 11 November 2026 at 14:57 UTC
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Latest Articles (186 today)

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Defender 11 November 2026
N-able releases security hotfixes for zero-day vulnerabilities
N-able released hotfixes to address zero-day bugs affecting its N-central remote monitoring and management (RMM) platform, which were publicly disclosed over the weekend and forced it to take…
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Defender 11 November 2026
Microsoft fixes audio issues caused by September security updates
Microsoft says the November 2026 cumulative updates resolve USB audio issues plaguing Windows users who have installed security updates released since September. [...]
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Defender 11 November 2026
CISA flags Cisco BroadWorks flaw as actively exploited in attacks
The US Cybersecurity and Infrastructure Security Agency (CISA) warned on Tuesday that hackers are now exploiting a high-severity Cisco BroadWorks vulnerability in attacks. [...]
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Defender 11 November 2026
Microsoft fixes Exchange sign-ins broken by Windows Server updates
Microsoft has fixed Outlook sign-in and mail delivery issues on Exchange Server systems after installing the October 2026 Windows Server security updates. [...]
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Defender 10 November 2026
Detecting sleeper agents hiding in AI model neurons
Microsoft Research has released new threat research detailing how a capable agent model could be turned into a sleeper agent by editing fewer than ten neurons to inject a short payload; Microsoft…
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Defender 10 November 2026
Railway breach leads to $740,000 in fraudulent AI charges
Cloud hosting provider Railway says hackers exploited vulnerabilities in its infrastructure to steal customer authentication secrets and generate approximately $740,000 in fraudulent AI usage,…
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Defender 10 November 2026
Japanese furniture giant Nitori says hackers stole 37.6M customer records
Nitori, a major Japanese furniture and home accessories retailer, discovered that an attacker accessed a system on its network and may have stolen 37.62 million customer records. [...]
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Defender 10 November 2026
Microsoft releases Windows 10 KB5131096 extended security update
Microsoft released the Windows 10 KB5131096 extended security update, which includes this month's November 2026 Patch Tuesday fixes and a few bug fixes and changes. [...]
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Defender 10 November 2026
Hackers exploit trusted AWS access to breach multiple cloud environments
A threat actor used compromised identity and access management (IAM) credentials for a Qubole big data platform's AWS account to access and exfiltrate data from multiple customers' AWS environments.…
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Defender 10 November 2026
Microsoft November 2026 Patch Tuesday fixes 1,235 flaws, Outlook zero-day
Today is Microsoft's November 2026 Patch Tuesday, with security updates addressing a record-breaking 1,235 flaws, including one actively exploited Microsoft Outlook zero-day vulnerability. [...]
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Defender 10 November 2026
Windows 11 KB5132061 & KB5131087 cumulative updates released
Microsoft has released the Patch Tuesday Windows 11 and cumulative updates for versions 26H2/25H2/24H2 and 23H2 to fix security vulnerabilities and bugs, and add new features. [...]
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Defender 10 November 2026
Critical Xen Orchestra auth bypass flaw exploited to hijack VM servers
A critical authentication bypass vulnerability in Xen Orchestra is being actively exploited in attacks that could grant administrator privileges and allow takeover of XCP-ng virtualization hosts.…
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Defender 10 November 2026
Binance warns of iOS flaw that could leak crypto wallet secrets
Binance is warning about a vulnerability in Apple's iOS 26.7.1, 27.0.1, and 27.2 that could allow third-party apps to read private files stored by other apps, including cryptocurrency seed phrases,…
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Defender 10 November 2026
Ransomware recovery is now a client retention metric
Recovering from ransomware doesn't guarantee an MSP will retain its clients, especially when delays, poor communication, and unexpected costs undermine trust. Kaseya examines how disconnected…
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Defender 10 November 2026
SAP patches ICM2SHELL and PROXYGATE maximum severity flaws
SAP patched 35 vulnerabilities in its November 2026 security updates, including four maximum-severity issues affecting its NetWeaver, Web Dispatcher, and Gateway software. [...]
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Defender 10 November 2026
Hackers now exploit critical Barracuda ESG flaws to gain root access
Cybersecurity company Barracuda Networks warned that attackers have begun exploiting two recently patched Email Security Gateway (ESG) vulnerabilities that let them run commands with root privileges.…
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Defender 10 November 2026
Turla hackers use new Cereal malware to spy on govt Exchange servers
The Russian state-backed threat group Turla has been using a new malicious toolset called 'Cereal' to intercept emails on Microsoft Exchange servers at government organizations. [...]
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Defender 10 November 2026
Google patches eighth Chrome zero-day exploited in attacks this year
Google has released emergency security updates to patch a new Chrome vulnerability exploited in zero-day attacks, the eighth such flaw since the start of the year. [...]
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Defender 10 November 2026
Fireworks AI discloses new breach after cloud provider hack
AI infrastructure startup Fireworks has disclosed a new security breach in which attackers accessed its development machines after breaching a third-party cloud provider. [...]
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Defender 9 November 2026
Vanderbilt University hit in BYOD ransomware attack, data theft claimed
Vanderbilt University warns it is responding to a cyberattack claimed by the BYOD ransomware gang, which claims to have encrypted the university's databases and stolen sensitive student, employee,…
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Defender 9 November 2026
SEGA newsletter data breach exposes 2.2 million email addresses
Japanese gaming giant SEGA has disclosed that a data breach at its third-party newsletter provider, ARARA, exposed the email addresses of 2.2 million newsletter subscribers. [...]
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Defender 9 November 2026
N-able takes cloud platform offline after 30+ "zero-days" published
N-able has taken its hosted N-central environments offline and urged on-premises customers to shut down their servers after a security researcher publicly disclosed more than 30 alleged zero-day…
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Defender 9 November 2026
York University breach exposed personal information dating to 2007
York University has announced it suffered a cybersecurity incident in which a threat actor stole personal information people submitted through online forms. [...]
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Defender 9 November 2026
FORGE Lab uses agentic tools to identify memory safety issues in Rust
Microsoft FORGE Lab researchers found memory-safety bugs in Rust's core and std libraries, including cases where safe Rust code can trigger undefined behavior. Using Hyenas, FORGE's frontier research…
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Defender 9 November 2026
France blames Iranian hackers for supermarket attacks that sparked fires
France has linked October cyberattacks that disrupted refrigeration systems at more than 700 supermarkets and other retail locations to Iranian state-backed hackers, saying the attacks caused food…
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Defender 9 November 2026
Russian cloud firm Beget rebuilds from scratch after data wiper attack
A data-wiping malware attack has forced Russian cloud services provider Beget to rebuild its cloud infrastructure from scratch, the company said. [...]
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Defender 9 November 2026
Binance denies data breach after alleged ShinyHunters claims
Binance, the world's largest crypto exchange, has denied claims of a new security breach made by a threat actor using the 'ShinyHunters' handle on a newly emerged underground cybercrime forum. [...]
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Defender 9 November 2026
Hackers exploit SSHole OpenSSH flaw to breach Linux systems
Hackers are actively exploiting the "SSHole" vulnerability (CVE-2026-123158) in OpenSSH to execute commands, steal credentials, and establish persistent access. [...]
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Defender 9 November 2026
The Biggest Threat to Your GRC Job Isn’t AI. It’s Ignoring AI.
AI agents are taking over routine governance, risk, and compliance tasks, forcing GRC professionals to rethink the skills needed to stay relevant. Anecdotes examines three essential skills for the…
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Defender 9 November 2026
FBI agent stole $2.5 million in crypto from hackers under investigation
A former FBI agent has pleaded guilty to stealing nearly $2.5 million from the wallets of fraud victims and nation-state hackers under investigation. [...]
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Defender 9 November 2026
US bans MEXC crypto exchange over sanctions evasion, cybercrime links
The US Department of the Treasury has cut off the MEXC Global crypto exchange from the US financial system over sanctions evasion and links with cybercrime gangs. [...]
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Defender 9 November 2026
Ukraine dismantles crypto scam network that stole €4.3 million
Ukrainian law enforcement arrested four suspects in a case involving the theft of more than €4.3 million using a network of cryptocurrency investment scam call centers. [...]
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Defender 8 November 2026
Iris Ohyama data cloud breach exposes info of 7.7 million customers
Japanese manufacturer Iris Ohyama, the operator of the Iris Plaza shopping platform, disclosed that personal information belonging to about 7.7 million people may have been exposed after unauthorized…
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Defender 7 November 2026
Hackers pull off $133 million French bank heist via service provider
French cooperative bank Crédit Mutuel Arkéa was targeted in a cyberattack that enabled fraudulent transactions of up to $133 million, forcing it to respond by suspending certain systems.v [...]
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Defender 7 November 2026
CTM360 Exposes Fake Gift Card Scams Exploiting Trusted Brands
Scammers are impersonating major brands and celebrities to lure consumers into fake gift card giveaways that collect personal information and trigger unwanted subscriptions. CTM360 reveals how these…
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Defender 7 November 2026
ARTEX abuse expands as cybercriminals target financial sector
In October 2026, the financially motivated threat actor Storm-3358 began targeting organizations in the financial sector using the agentic AI offensive framework ARTEX. The post ARTEX abuse expands…
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Defender 7 November 2026
SonicWall warns of new SSL-VPN MFA bypass flaw exploited in attacks
SonicWall has released security updates to fix seven vulnerabilities in SonicOS firewalls, including an SSL-VPN authentication bypass flaw exploited in attacks. [...]
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Defender 6 November 2026
Runaway AI hacking agent behind WorkOS breach after escaping sandbox
WorkOS says an AI-powered hacking agent that breached its internal sales application and accessed customer information was operated by a security researcher who claims the tool escaped its testing…
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Defender 6 November 2026
OpenAI's new GPT-6 Cyber AI finds 81 Firefox flaws, 948 Linux bugs
OpenAI has revealed GPT-6 Cyber, a new artificial intelligence model that has discovered 81 previously unknown high-severity Firefox vulnerabilities and developed working exploits for 948 distinct…
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Defender 6 November 2026
Fake security tools on GitHub push backdoors and infostealers
Cybersecurity professionals are being targeted with infected security projects on GitHub that deploy a backdoor and information stealer malware. [...]
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Defender 6 November 2026
QNAP says hackers breaching NAS devices in Plex2Shell attacks
QNAP urges users to update Plex Media Server to the latest version available in the QNAP App Center, as hackers are exploiting the Plex2Shell vulnerability chain. [...]
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Defender 6 November 2026
Veeam warns of Software Appliance boot failures on AMD EPYC hosts
​Veeam warned customers about boot failures affecting Software Appliance virtual machines (VMs) on hosts with AMD EPYC processors. [...]
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Defender 6 November 2026
IMSI vs IMEI: What Your Phone Broadcasts and Who Can Read It
IMSI and IMEI are IDs your phone shares with networks. Learn how they differ, how attackers get them, and why rotating your IMSI blunts tracking. [...]
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Defender 6 November 2026
Chainalysis says breach exposed credentials for all customers
Blockchain intelligence firm Chainalysis says a recent attack on its systems and internal tools has exposed credentials and live tokens for all customers. [...]
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Defender 6 November 2026
D-Link warns of multiple zero-days in DGS-3130 Series switches
D-Link shared mitigation measures for multiple unpatched security flaws affecting DGS-3130 series managed Gigabit stackable switches. [...]
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Defender 6 November 2026
MetaMask says recent attack didn't affect wallet infrastructure
Cryptocurrency wallet provider MetaMask said a recent security incident has not affected MetaMask wallets or its wallet infrastructure. [...]
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Defender 6 November 2026
FBI, CISA warn of cyberattacks targeting refrigeration systems
The FBI and CISA warn that hackers are actively targeting industrial refrigeration and cold-chain monitoring systems worldwide, potentially causing food spoilage, equipment damage, and fire hazards.…
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Defender 5 November 2026
Threat actors use agentic AI tooling to find and abuse exposed secrets
Microsoft Threat Intelligence has observed threat actors using the agentic offensive security framework ARTEX to search GitHub for OAuth application secrets, which can be used to compromise the…
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Defender 5 November 2026
Fake OpenAI, SpaceX events used to steal Microsoft, Google accounts
Hackers are using fake OpenAI, SpaceX, and Anthropic event invitations to lure employees into phishing attacks, using two different phishing-as-a-service platforms to steal Microsoft and Google…
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Defender 5 November 2026
Nearly 1.5 million exposed secrets targeted in new revocation program
Truffle Security has launched the Secrets Revocation Program, a free initiative that helps API key issuers revoke 1.4 million publicly exposed secrets that remain valid. [...]
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Defender 5 November 2026
OpenAI’s GPT-6 Astra silently obstructed safety research tasks
OpenAI has disclosed another AI alignment incident where GPT-6 Astra was found to sometimes quietly withhold help on safety research. [...]
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Defender 5 November 2026
OpenSSH flaw lets attackers log into password-disabled Linux accounts
A newly disclosed OpenSSH vulnerability dubbed "*sshole" allows attackers to log in to certain Alpine Linux and other musl-based Linux accounts that are configured to block password authentication,…
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Defender 5 November 2026
New investments to reduce on-premises security risk
We’re announcing a new on-premises security initiative, bringing together guidance, migration, and product investments. The post New investments to reduce on-premises security risk appeared first on…
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Defender 5 November 2026
​​​​What’s new in Microsoft Security: November 2026
Microsoft Security’s November 2026 updates strengthen AI agent security, least privilege, threat protection, and exposure management. The post ​​​​What’s new in Microsoft Security: November 2026…
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Defender 5 November 2026
Hackers backdoor Linux servers using trojanized CWP web server
A new Linux malware called CWPdoor is being distributed through a trojanized version of cwpsrv, the web server behind the Control Web Panel (CWP) management interface. [...]
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Defender 5 November 2026
DigiCert data breach exposes customer information, identity documents
DigiCert warns it suffered a data breach after a server migration mistakenly exposed an internal business system to the internet, allowing unauthorized access to customer information and identity…
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Defender 5 November 2026
Email threat landscape: Q3 2026 trends and insights
Microsoft Threat Intelligence observed a sharp rise in email-based phishing activity at the end of Q3 2026 (July – September), even as QR code phishing declined, CAPTCHA-gated phishing recovered, and…
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Defender 5 November 2026
Closing the Identity Gap at the Service Desk
Attackers target IT service desks to bypass MFA by impersonating employees and convincing staff to reset passwords or register new authentication devices. Specops Software explains why traditional…
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Defender 5 November 2026
GhostMap Android flaw lets malicious app trigger persistent boot loop
Attackers can force Android devices into a continuous boot loop using a specially crafted app that requires no permissions and only needs to be installed. [...]
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Defender 4 November 2026
Vercel rolls out new protection against stolen session cookie attacks
Vercel is gradually rolling out Device Bound Session Credentials (DBSC) on its platform as a key defense against information stealer malware. [...]
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Defender 4 November 2026
Zyxel fixes zero-day exploited to hack nearly 1,000 network switches
Zyxel has patched a zero-day vulnerability in its GS1900 series network switches that hackers exploited to compromise nearly 1,000 devices worldwide and steal configuration files and credentials.…
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Defender 4 November 2026
DreamHost confirms data breach exposed FTP logins and webmail sessions
DreamHost is warning of a data breach after attackers gained access to its File Manager platform for two months and stole customers' FTP/SFTP usernames and passwords. [...]
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Defender 4 November 2026
Cyberattack disrupts blood storage refrigeration systems in France
France's national blood service has confirmed that a cyberattack targeting a refrigeration equipment provider raised temperature and defrost settings at three of its facilities, threatening stored…
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Defender 4 November 2026
NIKKE PC game launcher hacked to spread remote access, data-stealing malware
The developers of Goddess of Victory: NIKKE have confirmed that hackers tampered with the game's PC launcher scripts in a supply-chain attack, distributing malware capable of stealing credentials and…
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Defender 4 November 2026
mSecure password manager hack prompts password reset warnings
mSeven Software is warning current and former mSecure password manager customers to change passwords, reset two-factor authentication, and remove passkeys following a cyberattack that reportedly…
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Defender 4 November 2026
Google Calendar phishing campaign hijacks sessions, bypasses MFA
A phishing campaign used Google Calendar invites, trusted redirects, and fake login pages to hijack corporate Google sessions and bypass MFA protections. Material Security examines how Operation…
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Defender 4 November 2026
SonicWall warns of unpatched flaws in end-of-life GMS software
SonicWall warned customers of two security flaws affecting end-of-life Global Management System (GMS) systems that will not be patched. [...]
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Defender 4 November 2026
US charges two Canadians accused of hacking US universities
A federal grand jury indicted two Canadians suspected of hacking multiple US universities and using the compromised systems to mine for cryptocurrency. [...]
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Defender 4 November 2026
CISA flags WordPress RCE flaw as actively exploited in attacks
The US Cybersecurity and Infrastructure Security Agency (CISA) warned federal agencies that attackers have started exploiting a recently patched high-severity WordPress vulnerability in the wild.…
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Defender 4 November 2026
Hackers use n-day exploits in zero-click attacks on iOS, Android devices
A large-scale watering hole attack associated with Russian hackers has been targeting iOS and Android users visiting compromised sites or fake ones impersonating legitimate portals. [...]
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Defender 3 November 2026
Hackers hijack cPGuard autoupdate to deploy backdoor, steal data
Attackers have compromised the update infrastructure for the cPGuard web security suite to distribute a backdoor and a data-stealing script. [...]
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Defender 3 November 2026
WorkOS says attacker used ARTEX AI to breach internal sales app
Developer platform WorkOS suffered a data breach after a threat actor accessed business contact records and summaries of customer communications. [...]
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Defender 3 November 2026
Binance says fake job interview led to $6.3 billion crypto heist
Cryptocurrency exchange Binance says North Korean hackers used a fake job interview to trick an employee into installing malware that ultimately let them compromise the company's wallet…
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Defender 3 November 2026
Google: LLMjacking attacks rack up $1 million in cloud AI charges
Large language model hijacking attacks, also known as LLMjacking, are generating large fraudulent cloud charges, with some organizations losing more than $100,000 per day. [...]
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Defender 3 November 2026
Fake-download campaign uses trojanized installers to deliver monetization payloads
Microsoft Threat Intelligence tracks a fake-download campaign that uses trojanized Inno installers to deliver multiple monetization offers and provides detection and investigation guidance across the…
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Defender 3 November 2026
Microsoft named a Leader in the 2026 Gartner® Magic Quadrant™ for AI Agent Management Platforms
Read why Gartner named Microsoft a Leader in the inaugural 2026 Magic Quadrant for AI Agent Management Platforms. The post Microsoft named a Leader in the 2026 Gartner® Magic Quadrant™ for AI Agent…
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Defender 3 November 2026
Barracuda warns of critical flaws allowing root access to devices
Cybersecurity company Barracuda Networks warned customers to patch two vulnerabilities that can let attackers run commands with root privileges. [...]
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Defender 3 November 2026
Gartner Predicts SOCs Will Have 50% More Engineers Than Analysts by 2028
Gartner predicts that security operations centers will have 50% more engineers than analysts by 2028 as AI agents take over routine alert handling. Prophet Security examines how AI is reshaping SOC…
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Defender 3 November 2026
UK school estate hit by 3AM ransomware in suspected AI-assisted attack
A 3AM ransomware affiliate targeted a school estate in the UK and successfully encrypted around 37 of nearly 50 machines reached from an unmanaged host. [...]
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Defender 3 November 2026
Police seizes over 100 servers in investment scam crackdown
European law enforcement authorities arrested seven suspects and seized more than 100 servers in a joint action targeting an unnamed company suspected of providing fraudulent trading websites to…
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Defender 3 November 2026
Google adds new $250,000 Cloud VRP reward for Root-in-Cloud bugs
Google has expanded its Cloud Vulnerability Reward Program (VRP) with a new top-tier reward for high-impact architectural security flaws. [...]
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Defender 3 November 2026
Harvard University data breach exposed info of 851,000 accounts
Hackers who breached Harvard University's Alumni Affairs and Development systems in November 2025 stole data linked to more than 850,000 unique email addresses, according to breach notification…
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Defender 2 November 2026
Chinese hackers use ARTEX AI in automated attacks against 200 orgs
Chinese hackers used ARTEX, an open-source, multi-agent AI penetration-testing framework, in attacks against more than 200 organizations across 14 countries. [...]
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Defender 2 November 2026
What exploited vulnerabilities have in common: A data-driven analysis of real-world attacks
Real-world exploitation concentrates in a small, high-impact subset of CVEs. Learn how defenders can prioritize vulnerabilities based on exploitation likelihood, exposure, and potential blast radius.…
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Defender 2 November 2026
Fintech platform Sageworks taken offline after suspected cyberattack
Financial technology company Abrigo has restored its Sageworks risk management application, except for borrower-facing capabilities, following an outage triggered by "irregular activity" in its…
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Defender 2 November 2026
Google disrupts million-device XCPE Android malware botnet, bans TV box maker
Google and industry partners have dismantled the XCPE malware botnet consisting of more than 1.3 million Android TV streaming TV boxes that Google says its manufacturer intentionally infected with…
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Defender 2 November 2026
BTCPay Server warns of hot wallet crypto thefts on outdated instances
The maintainer of BTCPay Server, an open-source cryptocurrency payment processor, has urged users to install the latest version as hackers have been draining "hot wallets" on instances running older…
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Defender 2 November 2026
Your Mobile Carrier Stores Your Call Logs for Years
Mobile carriers can retain years of call and text metadata, exposing sensitive details about customers' relationships, locations, and daily routines if breached. Cape examines the privacy risks of…
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Defender 2 November 2026
Hackers disrupt refrigeration systems at European supermarkets
A cyberattack on refrigeration systems has disrupted stores run by multiple supermarket chains across several European countries after hackers remotely changed temperature settings on freezers and…
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Defender 2 November 2026
Microsoft fixes Smart App Control broken by October Windows update
Microsoft has resolved a known issue that prevented some users from activating the Smart App Control security feature after installing the October 2026 KB5127648 Windows 11 security update. [...]
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Defender 2 November 2026
Over 1,000 GitLab servers vulnerable to ongoing RCE attacks
Over 1,000 Internet-exposed GitLab servers are still unpatched against a maximum-severity flaw actively exploited in remote code execution attacks. [...]
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Defender 2 November 2026
Synology warns of C3RB3R ransomware attacks targeting NAS devices
Taiwanese network-attached storage (NAS) appliance maker Synology warned customers to update their devices immediately due to a surge in C3RB3r ransomware attacks. [...]
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Defender 2 November 2026
Ivanti patches two more Connect Secure zero-days chained in attacks
Ivanti released security updates to patch two more Connect Secure (ICS) remote access gateway flaws that have been chained in zero-day attacks since at least October 1. [...]
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Defender 1 November 2026
FBI links $6.3 billion Binance crypto heist to North Korean hackers
The FBI has confirmed that North Korean state-sponsored hackers known as TraderTraitor were behind the $6.3 billion crypto-theft attack on Binance, making it the largest cryptocurrency heist on…
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Defender 1 November 2026
Alpine Linux rebuilds GitLab after attempted RCE attack
Hackers attempted to exploit a critical GitLab vulnerability in Alpine Linux's development infrastructure on October 20-21, prompting the open-source project to rebuild its GitLab server and reset…
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Defender 1 November 2026
OpenAI says it's doubling Pro usage limits and bringing Work features to Chat
OpenAI has just confirmed that it's rolling out ChatGPT Work capabilities directly into regular Chat, while also combining usage allowances across ChatGPT and Codex. [...]
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Defender 31 October 2026
Northflank security breach leads to abuse of customers' AI API keys
Cloud application hosting platform Northflank is warning customers to rotate all credentials and secrets stored on its platform after a security breach led to unauthorized use of customers' AI API…
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Defender 31 October 2026
New Android SMS of Death exploit can remotely crash unpatched phones
A security researcher has released a proof-of-concept exploit for a recently patched Android vulnerability, dubbed "SMS of Death" and tracked as CVE-2026-58882, that lets attackers remotely disrupt…
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Defender 31 October 2026
Reddit to lock content behind logins to fight scrapers
Reddit announced in a post by co-founder Steve Huffman that the site will gradually become a "logged-in service," offering limited access to visitors without accounts. [...]
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Defender 31 October 2026
From Beginner to Bug Hunter: Learning Cybersecurity in the AI Era.
AI-generated vulnerability reports are overwhelming some bug bounty programs, making it harder for aspiring security researchers to know where to start. TryHackMe explains how beginners can build…
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Defender 31 October 2026
Chainalysis discloses data breach from "offensive agentic techniques"
Blockchain analytics firm Chainalysis disclosed a data breach after attackers used "offensive agentic techniques" to access internal systems and tools, exposing customer names, email addresses, user…
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Defender 31 October 2026
Inside a malicious Claude Code-branded extension and its persistent SSH backdoor
Microsoft analyzes a malicious Claude Code–branded extension, its persistent SSH backdoor, and guidance to detect and remediate it. The post Inside a malicious Claude Code-branded extension and its…
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Defender 30 October 2026
Critical Linux kernel flaw allows remote root attacks on MPTCP servers
Security researchers at Anthropic have developed an exploit for a critical Linux kernel vulnerability that allows unauthenticated attackers to remotely execute commands as root on servers running…
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Defender 30 October 2026
From help desk impersonation to AD CS abuse: Investigating ESC1 and ESC8 intrusion paths
Teams support impersonation led to remote access, malicious runtime execution, and Certificate Services abuse through authentication relay and Kerberos. The post From help desk impersonation to AD CS…
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Defender 30 October 2026
Trezor warns of suspected crypto-theft implant in hardware wallet
Hardware wallet device maker Trezor has received credible reports about a suspected hardware crypto-theft implant in a Trezor Safe 5 sold by its reseller CryptoBilis in Southeast Asia. [...]
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Defender 30 October 2026
Malicious Claude Code extension on Cursor planted SSH backdoors
A malicious version of Anthropic's Claude Code VS Code extension was distributed through Cursor's extension marketplace for approximately 11 hours on October 29, exposing up to 5,000 developers to…
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Defender 30 October 2026
SS7 and Diameter Attacks: How Signaling Flaws Expose Your Phone
Flaws in SS7 and Diameter signaling protocols can allow attackers to track phone locations, intercept calls and SMS verification codes, and impersonate subscribers without compromising their devices.…
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Defender 30 October 2026
CISA says max severity GitLab flaw now exploited in the wild
Attackers have started exploiting a maximum-severity GitLab vulnerability patched earlier this month, according to the US Cybersecurity and Infrastructure Security Agency (CISA). [...]
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Defender 30 October 2026
Microsoft finally fixes VPN issues caused by September updates
Microsoft has resolved Always On VPN connection failures triggered after installing the September 2026 Windows 11 security updates. [...]
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Defender 30 October 2026
Drupal warns of critical Commerce Core flaw exploited in attacks
Drupal warned admins to patch a critical access bypass vulnerability in the Commerce Core module that attackers are exploiting in the wild. [...]
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Defender 30 October 2026
Binance links $6.3 billion crypto theft to compromised DevOps laptop
Binance, the world's largest crypto exchange, has linked the theft of about $6.3 billion in cryptocurrency to a DevOps engineer's compromised laptop. [...]
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Defender 29 October 2026
OpenAI doubles ChatGPT Pro usage limits after backlash over planned 50% cut
OpenAI says it won't reduce usage limits for the $100, $200, and $500 ChatGPT Pro plans, as well as Business Premium, and it also promised to keep Dots usage independent. [...]
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Defender 29 October 2026
Binance probes potential $5.8 billion crypto-theft hack
Cryptocurrency exchange Binance is investigating a potential security breach involving up to $5.8 billion in digital assets, in what could become the largest cryptocurrency hack in history. [...]
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Defender 29 October 2026
Hugging Face malware campaign returns to hijack GPUs for crypto mining
A crypto-mining campaign abusing Hugging Face models returned days after takedown, hijacking GPU servers and planting backdoors, with one model downloaded over 28,000 times. Separately, a fake Solana…
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Defender 29 October 2026
Japan Airlines suffers third-party data breach exposing passenger info
Japan Airlines (JAL) has announced that a data breach at Amadeus's Passenger Service System exposed the data of about 92,000 customers. [...]
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Defender 29 October 2026
Polymarket halts trading after crypto-draining script breach, $2.5M traced
Prediction market platform Polymarket temporarily suspended trading on Thursday after hackers compromised a third-party service to distribute cryptocurrency-draining JavaScript, with approximately…
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Defender 29 October 2026
Fake crypto app on Apple App Store linked to $23K wallet theft
A fake cryptocurrency trading app called Padre Terminal, previously available on the Apple App Store for iOS devices, has been linked to the theft of approximately $23,000 from 27 Solana wallets.…
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Defender 29 October 2026
Hackers exploit Cisco SD-WAN flaw to deploy custom KeyDrift malware
A newly identified advanced persistent threat (APT) group tracked as UAT-11473 was observed exploiting CVE-2026-20127, an authentication-bypass flaw in Cisco Catalyst SD-WAN Controllers, to deploy a…
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Defender 29 October 2026
Chrome extensions with 13.4 million installs caught hijacking searches
A massive search-hijacking campaign involving 319 Chrome extensions with a combined 13.4 million reported installations redirected users' searches through tracking servers to generate advertising…
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Defender 29 October 2026
Now generally available: Discover local AI agents with Microsoft Defender
As local agents have moved from experimentation into everyday work, traditional security visibility is no longer enough. Unlike static software, local agents such as coding assistants, command-line…
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Defender 29 October 2026
Tracking AI adoption in North Korean threat actor tradecraft
As Microsoft Threat Intelligence continues to track how threat actors operationalize AI to increase the speed and efficiency of attacks, we’ve identified North Korean threat actors expanding their…
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Defender 29 October 2026
IDC MarketScape names Microsoft a Leader in the 2026 Worldwide Modern Endpoint Security for Enterprises Vendor Assessment
IDC has named Microsoft a Leader in the 2026 IDC MarketScape for Worldwide Modern Endpoint Security for Enterprises. The post IDC MarketScape names Microsoft a Leader in the 2026 Worldwide Modern…
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Defender 29 October 2026
Microsoft fixes Remote Desktop failures caused by recent Windows updates
Microsoft has resolved a known issue that prevents non-admin users from connecting to devices via Remote Desktop when the "Administrator protection" security feature is enabled. [...]
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Defender 29 October 2026
3 Ways AI Agents Already Operate in Your Browser
AI agents can control authenticated browsers, interact with corporate applications, and access sensitive data while appearing to act as legitimate employees. Keep Aware examines three ways agents…
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Defender 29 October 2026
CISA warns of Fragnesia Linux flaw chained in PHP2Shell attacks
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) warned federal agencies to patch a high-severity Linux kernel privilege escalation bug that attackers are chaining with the PHP2Shell…
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Defender 29 October 2026
Windows 11 KB5127936 update released with 41 changes and fixes
Microsoft released the KB5127936 preview cumulative update for Windows 11 versions 25H2 and 26H2, with 41 changes, including File Explorer and Cloud rebuild improvements. [...]
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Defender 29 October 2026
New Cisco firewall zero-day exploited to crash SSL VPN devices
Cisco released security updates to patch a denial-of-service zero-day in Adaptive Security Appliance (ASA) and Threat Defense (FTD) software that attackers are exploiting to remotely crash vulnerable…
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Defender 28 October 2026
Police seize Virtualine bulletproof service tied to ransowmare, cybercrime
U.S. law enforcement has seized the primary domain of Virtualine, a bulletproof hosting service advertised on cybercrime forums for facilitating illegal activities. [...]
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Defender 28 October 2026
Discord to let search engines index public server messages
Discord will allow search engines to index discussions in Discoverable Servers and make them accessible on the web to users outside the platform without an account or invitation. [...]
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Defender 28 October 2026
Sony ISP subsidiary data breach exposes 2.5 million customer records
Sony Network Communications has confirmed a data breach that compromised approximately 2.5 million records containing current and former customers' personal information. [...]
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Defender 28 October 2026
The CISO’s evolving role: Protecting and defending in the agentic era
As AI and agents reshape the enterprise, CISOs face two critical priorities: enabling innovation with the right identity and data guardrails, and modernizing defense to keep pace with AI-powered…
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Defender 28 October 2026
Volt Typhoon hides zero-day attacks using 'Silent Train' framework
Chinese state-sponsored hacking group Volt Typhoon has been using a framework that relies on rotating chains of connected devices compromised on demand, including for zero-day attacks targeting…
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Defender 28 October 2026
Microsoft urges Entra ID admins to migrate users to passkeys
Microsoft again asked Entra ID administrators to migrate users to phishing-resistant methods to avoid sign-in disruptions before it retires SMS and voice authentication in February 2027. [...]
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Defender 28 October 2026
InfraTrust report warns of exploited flaws in critical network infrastructure
Attackers are actively exploiting vulnerabilities across critical network infrastructure, and PHP flaws known as "PHP2Shell" put the web management interfaces of firewalls, VPNs, application delivery…
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Defender 28 October 2026
Even after PHP2Shell, blast radius matters more than a CVSS score
PHP2Shell shows how quickly attackers can exploit critical vulnerabilities, often before organizations have time to patch. Token Security explains why limiting the access of service accounts, API…
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Defender 28 October 2026
Hackers now scanning systems for recently-patched Oracle flaw
Attackers have begun probing the Internet for systems unpatched against a recently disclosed critical Oracle E-Business Suite (EBS) vulnerability. [...]
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Defender 28 October 2026
CISA warns of hackers now exploiting critical Node2Shell flaw
On Tuesday, the US Cybersecurity and Infrastructure Security Agency (CISA) confirmed that hackers have begun exploiting a critical Brotli vulnerability known as Node2Shell, Broccoli2Shell, and…
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Defender 28 October 2026
Nefilim and Hive ransomware affiliate gets 70 months in prison
A Ukrainian national was sentenced to 70 months in prison for his role in ransomware attacks targeting hospitals, government entities, and high-revenue businesses worldwide between 2018 and 2021.…
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Defender 27 October 2026
Japan's GMO urges customers to shut down PCs amid ransomware threat
The GMO Group has urged customers to disconnect their systems from the internet and shut down computers after a threat actor who breached the company's Onamae Desktop Cloud threatened to launch a…
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Defender 27 October 2026
OpenAI's GPT-6.1 Terra is safer overall, but shows more destructive-action flags in tests
OpenAI confirmed GPT-6.1 Terra is safer overall than some of its older models, but its safety testing also found other problems. [...]
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Defender 27 October 2026
UNM Health ransomware attack disrupts patient care, surgeries
The University of New Mexico Health Sciences Center disclosed a cyberattack that caused system outages and disrupted patient care and academic activities. [...]
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Defender 27 October 2026
Hackers hijack Convertr analytics script to steal payment card data
A credit card skimming group reportedly compromised a shared analytics script used by e-commerce platform Convertr to steal shoppers' payment data during checkout. [...]
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Defender 27 October 2026
Microsoft releases Windows OOB updates to distrust eMudhra certificates
Microsoft has released out-of-band (OOB) Windows updates to remove trust in certificates tied to compromised eMudhra certificate authority keys, protecting systems that do not receive automatic…
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Defender 27 October 2026
Warp discloses breach exposing AI agent logs, user telemetry data
Agent decision logs and telemetry data belonging to Warp agentic development environment users were exposed in an attack on a third-party vendor in the project's infrastructure. [...]
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Defender 27 October 2026
Tailscale warns of SSH flaws allowing root privilege escalation
The Tailscale security team is working to patch almost a dozen security vulnerabilities that could be exploited to steal credentials, crash servers, gain root privileges, and more. [...]
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Defender 27 October 2026
The Huntress Tragic Quadrant: Ranking Threats Hitting Businesses Hardest
Attackers are increasingly abusing legitimate IT tools, Microsoft 365 sessions, and everyday workflows to compromise businesses without triggering traditional defenses. Huntress Labs ranks the…
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Defender 27 October 2026
Apple backports CoreGraphics zero-day patches to older iPhones
​Apple has backported security patches released last month to older iPhones and iPads, addressing a zero-day bug exploited in "extremely sophisticated" targeted attacks on iOS devices. [...]
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Defender 27 October 2026
Energy giant ENGIE discloses data breach affecting customers
French energy giant ENGIE, one of the world's largest power and natural gas providers, confirmed that attackers stole customer data after breaching a marketing platform used by business partners.…
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Defender 27 October 2026
CISA confirms PHP2Shell vulnerabilities now exploited in attacks
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added the PHP2Shell vulnerabilities to its catalog of actively exploited security flaws and ordered federal agencies to patch…
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Defender 26 October 2026
University of Copenhagen data breach exposes data of 525,000 people
The University of Copenhagen in Denmark confirmed that hackers accessed one of its test environments containing personal data belonging to 525,000 people. [...]
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Defender 23 October 2026
Inside the LiteLLM 1.107.0 supply chain compromise: Credential theft through Python startup hooks
Microsoft Threat Intelligence analyzes the LiteLLM 1.107.0 compromise, including Python startup hooks, credential theft, remote code loading, detections, and mitigations. The post Inside the LiteLLM…
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Defender 22 October 2026
Railway warns devs to rotate secrets after potential breach
Cloud platform Railway published an urgent warning to users after detecting suspicious activity on its systems that store customer environment variables earlier this week. [...]
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Defender 22 October 2026
Capcom confirms data breach affecting 11.7 million accounts
Japanese gaming giant Capcom has confirmed that hackers breached its membership service, CAPCOM ID, exposing more than 11.7 million customer email addresses and associated information. [...]
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Defender 22 October 2026
LiteLLM release pipeline hacked to distribute info-stealer malware
Hackers compromised the LiteLLM project's PyPI package and published malicious Docker images with a payload that steals credentials, secrets, and environment variables. [...]
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Defender 22 October 2026
Arista patches new VeloCloud Orchestrator zero-day exploited in attacks
Arista Networks released security updates to patch an actively exploited zero-day vulnerability affecting VeloCloud Orchestrator (VCO) On-Prem deployments. [...]
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Defender 22 October 2026
Turn threat intelligence into informed action with Microsoft Defender
Every new threat raises a familiar set of questions. Is it targeting our industry? Are we exposed? What should we investigate first? Answering those questions takes more than another feed or a longer…
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Defender 22 October 2026
Microsoft shares how to fix broken Exchange Online EWS apps
Microsoft says IT admins can re-enable the retired Exchange Web Services (EWS) API in Exchange Online to fix EWS apps that have stopped working. [...]
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Defender 22 October 2026
Machine speed attacks require machine speed detection and response
Attackers can steal credentials and begin exfiltrating data within minutes, often before security teams can respond. Exaforce examines real-world attacks involving stolen GitHub tokens, malicious AI…
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Defender 22 October 2026
Amazon says PHP2Shell exploitation began 4 days before patches
Security researchers at Amazon Threat Intelligence say attackers began targeting the PHP2Shell flaws four days before security patches were released on Wednesday. [...]
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Defender 22 October 2026
GitLab warns of new max severity code execution vulnerability
GitLab has released security patches for a maximum-severity Regular Expression Compiler flaw that can let remote attackers run arbitrary code on vulnerable servers. [...]
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Defender 22 October 2026
Authorities disrupt nearly 11,000 cybercrime networks in Africa
Law enforcement agencies have disrupted nearly 11,000 cybercriminal networks and arrested more than 1,400 people in Operation Serengeti III, which targeted business email compromise, ransomware, and…
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Defender 21 October 2026
Google Chrome adds Gemini-powered scam detection, warns users of ClickFix attacks
Chrome is getting new scam protections that use Gemini to detect deceptive websites and warn users when they copy suspicious commands from ClickFix attacks. [...]
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Defender 21 October 2026
Japan's Onamae Desktop Cloud hacked, up to 27,000 servers affected
Hackers compromised the infrastructure of Onamae Desktop Cloud, a popular provider of VPS services in Japan, and installed malware on up to 26,739 customers' servers. [...]
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Defender 21 October 2026
Lazarus hackers use post-quantum cryptography for malware delivery
North Korean hackers are using a post-quantum cryptographic mechanism to secure malicious payload delivery in new operations that combine old and new malware. [...]
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Defender 21 October 2026
CISA: Hackers chain Plex flaws in Plex2Shell attacks to breach servers
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) is warning that attackers are actively exploiting four vulnerabilities in Plex Media Server. [...]
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Defender 21 October 2026
AI-driven, large-scale nation-state campaign using ARTEX enables supply chain compromise
Storm-0940 used ARTEX agentic AI to accelerate a ConnectWise supply chain compromise, enabling application credential abuse across Microsoft 365 environments. The post AI-driven, large-scale…
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Defender 21 October 2026
OpenAI agents disabled safety monitoring, one lied about it
OpenAI agents powered by the GPT-6.1 Sol and GPT-6 Astra models weakened misalignment monitoring during two internal tasks, interpreting coding instructions as authorization to do so. [...]
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Defender 21 October 2026
PHP ships emergency patches for critical PHP2Shell flaws
The PHP security team released emergency security patches for two critical remote code execution (RCE) vulnerabilities (CVE-2026-109618 and CVE-2026-109619) tracked collectively as PHP2Shell. [...]
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Defender 19 October 2026
Agents are your newest insiders. Security must move at their speed.
New capabilities in Microsoft 365 E7 and Project Perception help organizations contain agent risk and adapt protection continuously. The post Agents are your newest insiders. Security must move at…
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Defender 16 October 2026
Managing open-weight model risk in enterprise deployments
New whitepaper from Microsoft and NVIDIA helps enterprises manage open-weight AI model risks with a shared taxonomy, evaluations, and controls. The post Managing open-weight model risk in enterprise…
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Defender 16 October 2026
Burger King Japan data breach exposes 11 million customer records
Burger King Japan, the Japanese subsidiary of global fast-food giant Burger King, disclosed a major data breach after attackers accessed a server containing 11.18 million customer records. [...]
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Defender 16 October 2026
Microsoft: October Windows update may break Smart App Control
Microsoft says some users may have trouble turning on Smart App Control after installing this month's KB5127648 Windows 11 security update. [...]
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Defender 16 October 2026
BAE Systems cyberattack disrupts US federal court operations
The Administrative Office of the US Courts says a cyberattack on government contractor BAE Systems has taken down the notice system used by federal bankruptcy courts. [...]
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Defender 16 October 2026
BeyondTrust patches zero-day exploited in attacks since August
BeyondTrust warned customers on Thursday to patch a critical flaw in its Remote Support (RS) that has been exploited in zero-day attacks since late August. [...]
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Defender 15 October 2026
Hackers exploit Collabora RCE flaw to backdoor Nextcloud servers
Threat actors are exploiting a critical command execution flaw, now tracked as CVE-2026-110447, in the Collabora Online - Built-in CODE Server app (richdocumentscode) for Nextcloud. [...]
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Defender 15 October 2026
Android gets AI defenses against messaging scams, fake calls
Google announced new AI-powered defenses against scam messages and call-forwarding abuse on Android, currently rolling out to eligible devices. [...]
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Defender 15 October 2026
Hackers hijack D-Link, Ubiquiti devices to resell your stolen bandwidth
A proxyjacking campaign has impacted devices in 34 countries, monetizing victims' internet connections through a commercial residential proxy network. [...]
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Defender 15 October 2026
Fake Arch Linux packages push malware with root privileges
A threat actor uploaded malicious packages to the Arch User Repository (AUR) that impersonated two popular helper tools, yay and paru. [...]
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Defender 15 October 2026
Is AI pentesting as good as a human pentester?
AI pentesting can uncover vulnerabilities missed by human testers, but it also has limitations in consistency, risk assessment, and understanding business context. Intruder compares the strengths and…
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Defender 15 October 2026
Microsoft: Windows Server 2022 reached end of mainstream support
Microsoft announced that Windows Server 2022 has reached the end of mainstream support and will remain in extended support until October 2031. [...]
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Defender 15 October 2026
Police arrests 95 suspects in international CSAM crackdown action
Law enforcement authorities from 17 countries in Latin America and Europe have arrested 95 suspects in an INTERPOL-coordinated operation targeting the distribution of child sexual abuse material…
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Defender 15 October 2026
Microsoft fixes bug causing Windows black screens, Explorer crashes
Microsoft has resolved a known issue that was causing black screens, desktop loading issues, and Explorer crashes after installing Windows 11 updates released since August. [...]
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Defender 15 October 2026
UK Legal Aid Agency: Hackers stole records dating back to 1978
The Legal Aid Agency (LAA), an executive agency of the UK's Ministry of Justice that manages the country's Public Defender Service, says attackers who breached its IT systems in April 2025 stole…
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Defender 14 October 2026
Palo Alto Networks warns of PAN-OS RCE flaw exploited in attacks
Palo Alto Networks has released security updates for a high-severity PAN-OS RCE zero-day, tracked as CVE-2026-0322, that has been exploited in attacks targeting firewalls. [...]
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Defender 14 October 2026
FBI raids DPRK IT worker laptop farms in Texas, US nationals arrested
The U.S. Department of Justice (DoJ) has disrupted the Famous Chollima threat group's operations by arresting two suspects, charging 14 individuals, and seizing nearly 187 laptops used in North…
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Defender 14 October 2026
The hidden network: Inside the phishing infrastructure ecosystem powering global cybercrime
Microsoft uncovered a Chinese-language cybercriminal ecosystem, an interconnected network of phishing kit operators (tracked as Storm-2990), and an illicit marketplace (tracked as Storm-3119) selling…
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