---
id: CVE-2026-83711
title: >-
  Authorization bypass through user-controlled key in Microsoft Azure Active
  Directory B2C allows an unauthorized attacker to elevate privileges over a
  network.
summary: >-
  Authorization bypass through user-controlled key in Microsoft Azure Active
  Directory B2C allows an unauthorized attacker to elevate privileges over a
  network.
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N'
cwe:
  - CWE-639
published: '2026-09-03'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T15:32:16.500'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83711'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83711'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.00815
epssPercentile: 0.55266
ingestedAt: '2026-09-05T21:45:15.358Z'
vendor: Microsoft
product: Entra
affected:
  - Entra -
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-04T00:00:00+00:00'
---

## Overview

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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.