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 it has been enforcing multifactor authentication (MFA) for Azure Portal sign-ins across all tenants since March 2025. [...]
Microsoft announced that starting this Thursday, all college students in the United States can get a free year of Microsoft 365 Personal. [...]
Microsoft says the August 2025 security updates are triggering unexpected User Account Control (UAC) prompts and app installation issues for non-admin users across all supported Windows versions. [...]
Researchers have disrupted an operation attributed to Russian state-sponsored threat group Midnight Blizzard, who sought access to Microsoft 365 accounts and data. [...]