CVE-2026-69857: CWE-639: Authorization Bypass Through User-Controlled Key in Microsoft Azure Cosmos DB
Description
Authorization bypass through user-controlled key in Azure Cosmos DB allows an authorized attacker to perform spoofing over a network.
CVSS v3.1
Score 8.5high
Affected software
Microsoft
Azure Cosmos DB
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-69857 is an authorization bypass vulnerability categorized under CWE-639 affecting Microsoft Azure Cosmos DB. The vulnerability arises from improper authorization checks related to user-controlled keys, enabling an attacker with limited privileges to spoof network communications. The CVSS 3.1 base score is 8.5, reflecting high impact on confidentiality, integrity, and availability. Microsoft has released an official fix and manages remediation for this cloud-hosted service.
Potential Impact
An attacker with low privileges can bypass authorization controls by exploiting a user-controlled key, allowing spoofing over the network. This can lead to full compromise of data confidentiality, integrity, and availability within Azure Cosmos DB environments.
Mitigation Recommendations
Microsoft has provided an official fix for this vulnerability. As Azure Cosmos DB is a cloud service, Microsoft manages the remediation server-side. Users should verify that their service instances have been updated according to Microsoft's advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69857.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T22:51:46.191Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69857","vendor":"Microsoft"}]
Threat ID: 6a99fdbeacd9273b4999b6ab
Added to database: 09/03/2026, 23:07:42 UTC
Last enriched: 10/13/2026, 20:44:11 UTC
Last updated: 10/18/2026, 06:48:19 UTC
Views: 92
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