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 confirmed that Windows 11 is getting a new modern Run dialog with dark mode support and faster performance in a new preview build. [...]
Microsoft has fixed a known issue causing newly introduced Windows security warnings to display incorrectly when opening Remote Desktop (.rdp) files. [...]
Microsoft has updated a Windows 11 in-box app removal policy introduced in October to include a dynamic list that lets IT admins choose which preinstalled Store apps to uninstall. [...]
Microsoft has released the KB5083631 optional cumulative update for Windows 11, which includes 34 changes, such as a new Xbox mode for Windows PCs, enhanced security and performance for batch files, and performance improvements for launching startup apps. [...]
The April 2026 KB5083769 security update breaks third-party backup applications from multiple vendors on systems running Windows 11 24H2 and 25H2. [...]
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has ordered federal agencies to secure their Windows systems against a vulnerability exploited in zero-day attacks. [...]
Microsoft is working to resolve a known issue that prevents some Microsoft Teams Free users from chatting and calling others. [...]
Microsoft says it will start blocking legacy TLS connections for POP and IMAP email clients in Exchange Online starting in July 2026. [...]
Microsoft has confirmed a new issue causing newly introduced Windows security warnings to display incorrectly when opening Remote Desktop (.rdp) files. [...]
After addressing a widespread outage that affected Outlook.com users worldwide on Monday, Microsoft has asked iPhone users to re-enter their credentials to regain access to their Outlook and Hotmail accounts via the default Mail app. [...]
Microsoft is investigating an ongoing Outlook.com outage that is causing intermittent signing issues and preventing customers from accessing their mailboxes. [...]