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Threat Intelligence Report

Stealing OAuth Tokens Through Microsoft's Front Door

๐Ÿ“… September 23, 2026 ๐Ÿ“ฐ www.huntress.com ๐Ÿ” 0 CVE(s) referenced

Attackers with code execution on Developer Mode-enabled Windows systems can abuse Microsoft-signed AppX web hosts to steal durable Microsoft 365 OAuth tokens through a legitimate MFA flow, making network detection of MSAppHost/3.0 traffic to non-Microsoft destinations the key defense.

vendor

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