Microsoft has fixed a flaw in its Authenticator app for Android that let a malicious app with no permissions pose as a trusted Microsoft app, such as Teams, and collect sign-in tokens for a victim's work account.
Microsoft tracks the flaw as CVE-2026-80097 and fixed it in Authenticator for Android version 6.2606.4246, so anyone using the app should update.
In the researchers' tests,
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Microsoft Authenticator Flaw Let Permissionless Android Apps Steal Work Account Tokens