CVE-2026-83711

Received Received - Intake

Authorization Bypass in Microsoft Azure AD B2C

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-03

Last Modified

2026-09-03

Generated

2026-09-04

AI Q&A

2026-09-04

EPSS Evaluated

N/A

NVD

CVE-2026-83711

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	azure_active_directory_b2c	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-639	The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

Attack-Flow Graph

Executive Summary

This vulnerability is an authorization bypass in Microsoft Azure Active Directory B2C. It allows an unauthorized attacker to elevate their privileges over a network by manipulating a user-controlled key.

Impact Analysis

An attacker could gain unauthorized access to sensitive data or perform actions with elevated permissions, potentially leading to data breaches or system compromise.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating compliance requirements such as GDPR or HIPAA, which mandate strict access controls and data protection.

Mitigation Strategies

Apply the latest security updates from Microsoft for Azure Active Directory B2C. Review and restrict user-controlled key permissions to prevent unauthorized privilege escalation. Monitor for unusual activity in authentication logs.

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