CVE-2026-66803: Azure Cosmos DB Remote Code Execution Vulnerability

Overview

Severity

Critical (CVSS 10)

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

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Jul

Released

2026-07-30

EPSS Score

0.49% (percentile: 39.7%)

Description

Improper access control in Azure Cosmos DB allows an unauthorized attacker to execute code over a network.

FAQ

Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability? This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency. Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.

Affected Products (1)

Azure

• Azure Cosmos DB

Acknowledgments

<a href="https://x.com/yuvalavra">Yuval Avrahami</a> with <a href="https://wiz.io/">Wiz</a>, Lior Maman with <a href="https://wiz.io/">Wiz</a>, <a href="https://x.com/nirohfeld">Nir Ohfeld</a> with <a href="https://wiz.io/">Wiz</a>

Revision History

• 2026-07-30: Information published.