CVE record · CVE-2026-66803

Azure Cosmos DB Remote Code Execution Vulnerability

CVSS 10.0 CriticalCriticalEPSS 0.0090 · 60th percentile

Critical, because:

CVSS score 10.0: 9.0 or more.

Published by the CVE Program (CNA: microsoft) at 30 Jul 2026, 20:28 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Microsoft	Azure Cosmos DB	affected -

Identifiers: CVE-2026-66803
CNA: microsoft
Weakness (CWE): CWE-284
Tags: Microsoft Azure Cosmos DB
Broken access control
Published: 30 Jul 2026
Updated: 10 Nov 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
10.0	Critical	3.1	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	CNA (microsoft)

CISA KEV Not listed.
EPSS 0.0090, the 60th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

30 Jul 2026, 20:28 UTC Confirmed by the CVE List

Sources

References from the CNA

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66803 vendor-advisorypatch

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.