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CVE-2026-62916 – Authentication Bypass / Privilege Escalation – Microsoft Entra ID

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Summary

CVE-2026-62916 is a critical authentication bypass vulnerability (CWE-288: Authentication Bypass Using an Alternate Path or Channel) affecting Microsoft Entra ID, Microsoft’s cloud-based identity and access management service. The flaw allows an unauthorized attacker to bypass authentication controls via an alternate path and elevate privileges over a network, without requiring any prior privileges or user interaction. Microsoft has assigned this vulnerability a CVSS v3.1 base score of 9.1 (Critical) and published the record on September 3, 2026.

Technical details

  • Root cause: An authentication bypass condition in Microsoft Entra ID allows a request to reach protected functionality through an alternate path or channel that does not enforce the same authentication checks as the primary path.
  • Trigger conditions: No authentication (PR:N) and no user interaction (UI:N) are required to exploit the flaw; the attack complexity is rated low (AC:L).
  • Attack vector: Network (AV:N) — exploitable remotely over the internet against Microsoft’s hosted Entra ID service, with the impact scope unchanged (S:U).
  • Impact: Successful exploitation allows an unauthorized attacker to elevate privileges, with high impact to confidentiality and integrity (C:H/I:H); availability is not impacted (A:N). Given Entra ID’s role as the identity backbone for Microsoft 365 and Azure environments, exploitation could allow unauthorized access to tenant identities and resources protected by Entra ID.

Affected software

  • Microsoft Entra ID (cloud-hosted identity service) — affects the service itself; no customer-installed version ranges are specified because Entra ID is an exclusively cloud-hosted (SaaS) offering.

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C

Mitigation and recommended actions

  • Immediate: As Microsoft Entra ID is a Microsoft-hosted, exclusively cloud-based service, Microsoft has already deployed the fix server-side (Remediation Level: Official Fix). No customer-side patch or software update is required to receive the fix.
  • Recommended actions for customers:
    • Review Microsoft Entra sign-in and audit logs for anomalous authentication events or privilege-escalation activity that may indicate attempted or successful exploitation prior to remediation.
    • Ensure Conditional Access policies, multifactor authentication, and Privileged Identity Management (PIM) are enforced for all privileged and administrative accounts to limit the blast radius of any identity-layer compromise.
    • Monitor the official Microsoft Security Response Center (MSRC) advisory for this CVE for any updates, indicators of exploitation, or additional guidance.

References

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