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Microsoft Teams Bugs Enable Message and Caller Spoofing

🔒 Check Point researchers disclosed four vulnerabilities in Microsoft Teams that let attackers alter message content, spoof senders, and manipulate notifications to impersonate colleagues. The issues were reported in March 2024 and remediated across multiple updates beginning with an August 2024 fix for CVE-2024-38197, followed by patches in September 2024 and October 2025. Exploitable by external guests and internal actors alike, the flaws could trick users into clicking malicious links, sharing sensitive data, or accepting fraudulent calls by making messages and caller notifications appear to originate from trusted executives or coworkers.