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 fixed a known issue causing desktop and mobile email clients to fail to connect when using Outlook.com accounts. [...]
Free unofficial patches are available for a new Windows zero-day vulnerability dubbed 'EventLogCrasher' that lets attackers remotely crash the Event Log service on devices within the same Windows domain. [...]
New phishing attacks abuse Microsoft Teams group chat requests to push malicious attachments that install DarkGate malware payloads on victims' systems. [...]
Microsoft is investigating an issue that prevents Outlook and other email clients from connecting when using an Outlook.com account. [...]
Microsoft is investigating a second outage affecting Microsoft Teams users across North and South America in the last three days. [...]