Microsoft Azure Active Directory B2C Elevation of Privilege Vulnerability

Date Sep 3, 2026

Type Patch Tuesday

Signal Critical vendor advisory

Vendor / Product Microsoft · Microsoft Azure Active Directory B2C

CVE CVE-2026-83711

Critical vendor advisory CVE-2026-83711

Summary

Authorization bypass through user-controlled key in Microsoft Azure Active Directory B2C allows an unauthorized attacker to elevate privileges over a network. Published in September 2026 Early Security Updates. MSRC exploitability: Publicly Disclosed:No;Exploited:No;Latest Software Release:N/A.

Why it matters

Microsoft published this item through its Security Update Guide, making it part of Patch Tuesday triage for affected Windows, cloud, or application estates. EPSS percentile: 45%.

Operator check

Review the Microsoft Security Update Guide entry for CVE-2026-83711. Confirm whether Microsoft Azure Active Directory B2C is deployed, then apply the current security update or documented mitigation. CVSS score: 10.0. EPSS probability: 0.6%; percentile: 45%.

Sources

MSRC 2026-Sep Security Update Guide NVD — CVE-2026-83711

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

Get watched-vendor alerts Subscribe free Back to feed