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.
Microsoft has removed two more compatibility holds preventing customers from installing Windows 11 24H2 via Windows Update. [...]
Earlier this week, Microsoft patched a vulnerability that was flagged with the "highest ever" severity rating received by an ASP.NET Core security flaw. [...]
Microsoft has fixed a known issue breaking HTTP/2 localhost (127.0.0.1) connections and IIS websites after installing recent Windows security updates. [...]
Microsoft's October Windows 11 updates have broken the "localhost" functionality, making applications that connect back to 127.0.0.1 over HTTP/2 no longer function properly. [...]
Microsoft has disrupted a wave of Rhysida ransomware attacks in early October by revoking over 200 certificates used to sign malicious Teams installers. [...]
Microsoft reminded customers this week that Office 2016 and Office 2019 have reached the end of extended support on October 14, 2025. [...]
Microsoft announced today a new Windows 11 Copilot feature called Copilot Actions that enables AI agents to perform real tasks on local files and applications. [...]
Microsoft says Windows 11 users can now start a conversation with the AI-powered Copilot digital assistant by saying the "Hey Copilot" wake word. [...]
Microsoft has confirmed that the September 2025 security updates are causing Active Directory issues on Windows Server 2025 systems. [...]
A threat actor called TigerJack is constantly targeting developers with malicious extensions published on Microsoft's Visual Code (VSCode) marketplace and OpenVSX registry to steal cryptocurrency and plant backdoors. [...]
In what marks the end of an era, Microsoft has released the Windows 10 KB5066791 cumulative update, the final free update for the operating system as it reaches the end of its support lifecycle. [...]
Microsoft has reminded that Exchange Server 2016 and 2019 reached the end of support and advised IT administrators to upgrade servers to Exchange Server SE or migrate to Exchange Online. [...]
Today is Microsoft's October 2025 Patch Tuesday, which includes security updates for 172 flaws, including six zero-day vulnerabilities. Get patching! [...]
Microsoft has released Windows 11 KB5066835 and KB5066793 cumulative updates for versions 25H2/24H2 and 23H2 to fix security vulnerabilities and issues. [...]
Microsoft has reminded customers today that Windows 10 has reached the end of support and will no longer receive patches for newly discovered security vulnerabilities. [...]
Microsoft is restricting access to Internet Explorer mode in Edge browser after learning that hackers are leveraging zero-day exploits in the Chakra JavaScript engine for access to target devices. [...]
Microsoft is investigating an ongoing incident that is preventing some customers from accessing Microsoft 365 applications. [...]
Microsoft says the latest version of the Windows 11 Media Creation Tool (MCT) no longer works correctly on Windows 10 22H2 computers. [...]