CVE-2026-69857

Received Received - Intake

Authorization Bypass in Azure Cosmos DB via User-Controlled Key

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: Microsoft Corporation

Description

Authorization bypass through user-controlled key in Azure Cosmos DB allows an authorized attacker to perform spoofing over a network.

CVSS Scores

EPSS Scores

Probability:
Percentile:

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-2026-69857

Affected Vendors & Products

Currently, no data is known.

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 Azure Cosmos DB caused by user-controlled keys. An authorized attacker can exploit this to spoof identities over a network, potentially gaining unauthorized access to data or performing actions they shouldn't be able to.

Impact Analysis

If you use Azure Cosmos DB, an attacker could impersonate legitimate users or services, leading to data breaches, unauthorized modifications, or service disruptions. The high CVSS score (8.5) indicates significant risk of confidentiality, integrity, and availability impacts.

Compliance Impact

This vulnerability could lead to unauthorized access or data exposure, violating GDPR's data protection requirements or HIPAA's safeguards for protected health information. Compliance may be compromised if data is accessed or altered without authorization.

Mitigation Strategies

Apply the latest security updates from Microsoft for Azure Cosmos DB. Review and restrict network access to Cosmos DB endpoints. Monitor for unusual authentication patterns or unauthorized access attempts.

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