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 says Outlook for Web and the new Outlook for Windows will no longer display risky inline SVG images that are being used in attacks. [...]
Microsoft is working to resolve a bug that causes Defender for Endpoint to incorrectly tag some devices' BIOS (Basic Input/Output System) firmware as outdated, prompting users to update it. [...]
Microsoft is investigating a known issue that causes the classic Outlook email client to crash upon launch, which can only be resolved via Exchange Online support. [...]
Later this month, Microsoft will start automatically installing the Microsoft 365 companion apps on Windows 11 devices that have the Microsoft 365 desktop client apps. [...]
After rolling out Windows 11 25H2, also known as Windows 11 2025 Update, Microsoft has confirmed that the Media Creation Tool has stopped working on devices with Arm64 CPUs. [...]
Today, Microsoft announced the release of Windows 11 25H2, also known as Windows 11 2025 Update. [...]
Microsoft says it has "partially" resolved a known issue that caused problems when trying to play DRM-protected video in Blu-ray/DVD/Digital TV applications. [...]
Microsoft has released the KB5065789 preview cumulative update for Windows 11 24H2, which includes 41 improvements, including new AI actions in File Explorer and bug fixes for Windows Update and Windows Sandbox. [...]