Azure Cosmos DB Remote Code Execution Vulnerability
CVE-2026-66803 is a remote code execution vulnerability in Azure Cosmos DB (rated Critical, CVSS 10.0). Microsoft fixed it in the service; customers need to do nothing.
1 version
Facts
- Microsoft id
CVE-2026-66803- Products
- Azure Cosmos DB
- Severity
- Critical
- Impact
- Remote Code Execution
- CVSS
- 10.0
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
- Exploited
- No
- Publicly disclosed
- No
- Exploitability
- Exploitation Less Likely
- Customer action required
- No
- Release
- 2026-Jul
- Assigned by
- Microsoft
- Weakness
- CWE-284: Improper Access Control
- MSRC revision
- 1.0
- Status pages
- Azure Cosmos DB status
- First captured by us
- (from our first import of this list)
- Microsoft last modified
- Source
- Security updates · open the original at Microsoft
Microsoft's revision notes
- Revision 1.0, 2026-07-30:
Information published.
Microsoft says
Improper access control in Azure Cosmos DB allows an unauthorized attacker to execute code over a network.
What Microsoft changed
One version so far. If Microsoft edits it, each change shows here with what was removed and added.
First version we captured ·
The text as we first saw it
Seen by us · Microsoft's timestamp · Microsoft's page
Related changes
Other changes for Azure Cosmos DB
- Public Preview: vCore-based Azure Cosmos DB for MongoDB cross-region disaster recovery (DR) · In preview
- Public preview: Partition merge now supports shared throughput databases · In preview
- Public Preview: Mirroring Azure Cosmos DB in Microsoft Fabric · In preview
- Public preview: Microsoft Copilot for Azure capability now available in Azure Cosmos DB · In preview
- Public preview: Dynamic scaling per partition and per region · In preview
- Public preview: Priority-based execution in Azure Cosmos DB · In preview
- Generally Available: DiskANN in Azure Cosmos DB for NoSQL · Launched
- Public preview: Filtered vector search in vCore-based Azure Cosmos DB for MongoDB · In preview
Last updated