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.
Sophos finds fake Claude site spreading DonutLoader and a new Beagle backdoor via DLL sideloading
Cisco Talos uncovers CloudZ RAT and Pheno plugin abusing Microsoft Phone Link to intercept SMS OTPs
Microsoft researchers warn of a large-scale phishing campaign using fake compliance emails to steal credentials, targeting 35,000 users across 13,000 organizations worldwide
ESET warns that North Korean hackers compromised a Yanbian gaming site in a supply‑chain attack, trojanizing Windows and Android software to spy on users