Executive brief
Microsoft Entra ID (formerly Azure AD) is the identity and access management service that secures authentication and authorization for Microsoft cloud services and enterprise applications. A critical authentication bypass vulnerability allows remote attackers to bypass security controls and escalate their privileges without proper authorization, potentially compromising access to sensitive cloud resources and organizational data across Microsoft 365 and connected applications.
Technical details
This vulnerability is an authentication bypass in Microsoft Entra ID that exploits an alternate path or channel in the authentication mechanism, allowing an unauthenticated remote attacker to elevate privileges over the network. The vulnerability does not require user interaction or pre-existing privileges. An attacker can bypass the primary authentication controls by leveraging an unprotected secondary channel, leading to complete compromise of affected identities and potential lateral movement throughout the cloud infrastructure. Microsoft has released patches through their Security Update Guide.
Affected products
- Microsoft Entra ID <UNKNOWN>
Timeline
- 2026-09-03: disclosed