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.
An active campaign from a threat actor potentially linked to Russia is targeting Microsoft 365 accounts of individuals at organizations of interest using device code phishing. [...]
Microsoft has fixed a known issue causing "boot device inaccessible" errors during startup on some Windows Server 2025 systems using iSCSI. [...]
Microsoft has released the KB5051974 cumulative update for Windows 10 22H2 and Windows 10 21H2, which automatically installs the new Outlook for Windows app and fixes a memory leak bug. [...]
Today is Microsoft's February 2025 Patch Tuesday, which includes security updates for 55 flaws, including four zero-day vulnerabilities, with two actively exploited in attacks. [...]
Microsoft has released Windows 11 KB5051987 and KB5051989 cumulative updates for versions 24H2 and 23H2 to fix security vulnerabilities and issues. [...]
The Sandworm Russian military cyber-espionage group is targeting Windows users in Ukraine with trojanized Microsoft Key Management Service (KMS) activators and fake Windows updates. [...]
Microsoft announced over the weekend that it has expanded its Microsoft Copilot (AI) bug bounty program and increased payouts for moderate severity vulnerabilities. [...]