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 announced today that the Exchange Web Services (EWS) API for Exchange Online will be shut down in April 2027, after nearly 20 years. [...]
Microsoft has started rolling out built-in Sysmon functionality to some Windows 11 systems enrolled in the Windows Insider program. [...]
Hackers are targeting developers by exploiting the critical vulnerability CVE-2025-11953 in the Metro server for React Native to deliver malicious payloads for Windows and Linux. [...]
Hackers are targeting developers by exploiting the critical vulnerability CVE-2025-11953 in the Metro server for React Native to deliver malicious payloads for Windows and Linux. [...]
Ukraine's Computer Emergency Response Team (CERT) says that Russian hackers are exploiting CVE-2026-21509, a recently patched vulnerability in multiple versions of Microsoft Office. [...]
Microsoft has confirmed that a known issue preventing some Windows 11 devices from shutting down also affects Windows 10 systems with Virtual Secure Mode (VSM) enabled. [...]
Microsoft has fixed a known issue that was causing the password sign-in option to disappear from the lock screen options after installing Windows 11 updates released since August 2025. [...]