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  • PATCH AVAILABLE

CVE-2026-83711: pre-auth authorization bypass in Microsoft Entra

An unauthenticated attacker can bypass authorization in Microsoft Entra and gain elevated privileges, potentially accessing or modifying tenant resources; this issue is tracked as CVE-2026-83711. The flaw is a user-controlled key authorization bypass (CWE-639) affecting Entra (vendor branch listed as Entra) with no fixed versions published in the available data. Exploitation requires network access to the affected Entra endpoint and does not require prior credentials or user interaction.

Published Updated Source: CVE Program, NVD, FIRST EPSS, Vendor advisory

CVSS 3.1
10CRITICAL
EPSS
0.00815
CWE
CWE-639
KEV DUE DATE
Not listed
PATCH
Available

DIRAS TAKE

Treat this as high urgency: the flaw permits privilege elevation without credentials (pre-auth), so immediately reduce external exposure and prepare to apply vendor fixes or mitigations as they are released.

What is CVE-2026-83711?

An unauthenticated attacker can bypass authorization in Microsoft Entra and gain elevated privileges, potentially accessing or modifying tenant resources; this issue is tracked as CVE-2026-83711. The flaw is a user-controlled key authorization bypass (CWE-639) affecting Entra (vendor branch listed as Entra) with no fixed versions published in the available data. Exploitation requires network access to the affected Entra endpoint and does not require prior credentials or user interaction. The weakness is classified as CWE-639 (Authorization Bypass Through User-Controlled Key).

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Which versions of Microsoft Entra are affected?

BRANCHAFFECTEDFIXED
Entra-

Is CVE-2026-83711 being exploited?

There are no public reports of exploitation as of 2026-09-30.

How to fix CVE-2026-83711

  1. Follow Microsoft guidance and apply vendor patches or updates as soon as Microsoft publishes fixed Entra versions.
  2. Restrict network exposure of Entra management and API endpoints to trusted networks and IPs.
  3. Monitor authentication and authorization logs for unusual privilege changes or unexpected access to tenant resources.
  4. Implement compensating controls such as conditional access policies and least-privilege adjustments until a patch is applied.

Frequently asked questions

Is CVE-2026-83711 being actively exploited?

There are no public reports of active exploitation of CVE-2026-83711 as of 2026-09-30.

Which Entra versions are affected by CVE-2026-83711?

The advisory data lists the vendor branch as Entra but does not specify affected or fixed version numbers.

Is there a patch for CVE-2026-83711?

A vendor patch is indicated as available in the facts, but no specific fixed Entra version numbers are provided; apply vendor guidance and updates when Microsoft publishes exact fixes.

Does CVE-2026-83711 require authentication?

No, the vulnerability allows authorization bypass without prior credentials or user interaction, meaning authentication is not required for exploitation.

References