Nested App Authentication (NAA) Broker Abuse Detection

Ankit Mehta@Secvyn

•updated Jun 23, 2026•0•0•4

This rule detects Nested App Authentication (NAA) broker abuse, specifically when the Azure Portal silently acquires Microsoft Graph tokens for privileged first-party nested applications. It correlates these silent token acquisitions with a preceding interactive Azure Portal sign-in from the same user and IP address within a 30-minute window, indicating a potential AiTM (Adversary-in-the-Middle) kill chain indicator. The rule identifies known vulnerable nested application IDs and looks for 'refreshToken' or 'broker' as the incoming token type during the Graph token acquisition.