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Security analysts have found a severe security vulnerability in the desktop app for Microsoft Teams that gives threat actors access to authentication tokens and accounts with multi-factor authentication (MFA) turned on.

Microsoft Teams is a communication platform, included in the 365 product family, used by more than 270 million people for exchanging text messages, videoconferencing, and storing files.

The newly discovered security issue impacts versions of the application for Windows, Linux, and Mac and refers to Microsoft Teams storing user authentication tokens in clear text without protecting access to them.