CVE-2026-83711 CRITICAL

CVE-2026-83711: Microsoft Azure Active Directory B2C Elevation of Privilege Vulnerability

Vendor Microsoft

Product Entra

Weakness CWE-639 · IDOR

Published September 3, 2026

Last update September 4, 2026

View on NVD All CVEs

CVSS base score

10.0/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality High

Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C

What the vulnerability does

01Description

Authorization bypass through user-controlled key in Microsoft Azure Active Directory B2C allows an unauthorized attacker to elevate privileges over a network.

Key dates

02Disclosure timeline

September 3, 2026 CVE published

September 4, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-83711 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/639.html AskarLabs — CWE-639 write-up Authorization Bypass Through User-Controlled Key

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04Related CVE

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