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New BOF Tool Bypasses Microsoft Teams Cookie Encryption to Access User Chats

First seen 2 Dec 2025, 18:33 UTC • •

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ThreatCluster •March 12, 2026 at 13:27 UTC

A new BOF tool has been developed that exploits vulnerabilities in Microsoft Teams' cookie encryption, allowing attackers to access user chats. This tool poses a significant risk to user privacy and data security within the platform. Organizations using Microsoft Teams are advised to monitor for potential breaches and take necessary precautions.

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