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Critical Vulnerabilities in Microsoft Teams Enable Message Manipulation and Impersonation

Critical Vulnerabilities in Microsoft Teams Enable Message Manipulation and Impersonation

First seen 23 Nov 2025, 03:35 UTC • •

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ThreatCluster AI
ThreatCluster •March 12, 2026 at 13:27 UTC

Check Point Research identified four critical vulnerabilities in Microsoft Teams that allowed attackers to manipulate messages, spoof notifications, and impersonate executives. Both external hackers and malicious insiders were able to exploit these flaws, which have since been patched, posing significant risks to communication integrity within organizations.

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