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Microsoft 365 Users Targeted by Device Code Phishing Attacks

Microsoft 365 Users Targeted by Device Code Phishing Attacks

First seen 18 Dec 2025, 14:52 UTC • •

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ThreatCluster AI
ThreatCluster •March 12, 2026 at 13:27 UTC

Attackers are targeting Microsoft 365 users through device code authorization phishing, which tricks users into approving access tokens. This method exploits Microsoft's OAuth 2.0 device authorization grant flow, allowing attackers to gain control of enterprise accounts. The trend indicates a shift from traditional password theft to exploiting modern authentication mechanisms to bypass multi-factor authentication.

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