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Multiple Microsoft Teams vulnerabilities enable impersonation and message tampering

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Four security flaws in Microsoft Teams allowed attackers to manipulate conversations, impersonate colleagues, and exploit notifications. The vulnerabilities could alter message content without indicating edits, change sender identities, and modify display names in private chats and call notifications. These flaws were disclosed in March 2024 and addressed by Microsoft in subsequent patches. The vulnerabilities posed significant risks, enabling attackers to trick users into performing unintended actions, such as clicking malicious links or sharing sensitive data. The flaws affected both external guest users and internal malicious actors, undermining security boundaries and turning Teams into a vector for deception.

Timeline

  1. 04.11.2025 16:00 1 articles · 6d ago

    Microsoft Teams vulnerabilities disclosed in March 2024

    Four security flaws in Microsoft Teams were disclosed in March 2024. These vulnerabilities allowed attackers to manipulate conversations, impersonate colleagues, and exploit notifications. Microsoft addressed some of the issues under CVE-2024-38197 in August 2024, with additional patches in September 2024 and October 2025. The flaws enabled altering message content without indicating edits, changing sender identities, and modifying display names in private chats and call notifications.

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