Microsoft Authenticator Flaw Let Permissionless Android Apps Steal Work Account Tokens
AI-summarised brief · reviewed before publication
Microsoft fixed a flaw in its Android Authenticator app (CVE‑2026‑80097) that allowed a permissionless malicious app to masquerade as a trusted Microsoft app, such as Teams, and obtain sign‑in tokens for a victim’s work account. The vulnerability enabled full access to email, files, and calendar via Microsoft Graph tokens. The flaw required the victim to complete a sign‑in step in Authenticator and was not publicly exploited. Microsoft released the patch in version 6.2606.4246, urging all users to update.
💡 Why It Matters
- · The breach exposes a critical identity‑broker weakness that could let attackers impersonate legitimate Microsoft services, undermining enterprise authentication security.
- · Prompt updates are essential to prevent potential unauthorized access to corporate data.