Microsoft software and cloud platforms underpin enterprise systems, so vulnerabilities and security advisories can affect identity, data, and operations.
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Background for this topic.
Microsoft is a technology company whose Windows, Microsoft 365, Azure, identity services, and developer tools form a widely deployed enterprise computing ecosystem. Its security relevance spans endpoint and server software, cloud control planes, authentication, collaboration data, and the update mechanisms used to maintain them.
Security news under this tag commonly concerns vulnerabilities requiring patching, exploits against exposed services, identity or token compromise, and misconfiguration of cloud permissions or authentication policies. Practitioners should verify affected versions and exposure, apply updates or mitigations, enforce multifactor authentication and least privilege, and monitor relevant audit logs. Incidents involving Microsoft-hosted identities or data may require rapid session and credential containment, investigation across cloud and on-premises systems, and assessment of privacy or regulatory obligations.
Cybercriminals are abusing Microsoft's Trusted Signing platform to code-sign malware executables with short-lived three-day certificates. [...]
Cybercriminals are abusing Microsoft's Trusted Signing platform to code-sign malware executables with short-lived three-day certificates. [...]
Microsoft is investigating an Exchange Online bug causing anti-spam systems to mistakenly quarantine some users' emails. [...]
Valve has removed a game titled 'Sniper: Phantom's Resolution' from the Steam store following multiple user reports that indicated its demo installer actually infected their systems with information stealing malware. [...]
Two malicious VSCode Marketplace extensions were found deploying in-development ransomware from a remote server, exposing critical gaps in Microsoft's review process. [...]
Microsoft has lifted an upgrade block that prevented Asphalt 8: Airborne players from upgrading their systems to Windows 11 24H2 due to compatibility issues. [...]
Microsoft is investigating an ongoing outage preventing Outlook on the web users from accessing their Exchange Online mailboxes. [...]
Microsoft has fixed a bug causing the March 2025 Windows cumulative updates to mistakenly uninstall the AI-powered Copilot digital assistant from some Windows 10 and Windows 11 systems. [...]
At least 11 state-backed hacking groups from North Korea, Iran, Russia, and China have been exploiting a new Windows vulnerability in data theft and cyber espionage zero-day attacks since 2017. [...]
Microsoft has discovered a new remote access trojan (RAT) that employs "sophisticated techniques" to avoid detection, ensure persistence, and extract sensitive information data. [...]
Microsoft says the March 2025 Windows cumulative updates automatically and mistakenly remove the AI-powered Copilot digital assistant from some Windows 10 and Windows 11 systems. [...]
Cybercriminals are promoting malicious Microsoft OAuth apps that masquerade as Adobe and DocuSign apps to deliver malware and steal Microsoft 365 accounts credentials. [...]