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Vulnerability record · CVE-2026-66803 · published 30 July 2026

CVE-2026-66803: Microsoft azure cosmos db improper access control vulnerability

Microsoft · Azure Cosmos Db

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

10.0 CVSS 3.1 Critical EPSS 0.90% · top 41.9% CWE-284 · Improper access control
10.0CVSS 3.1 base score
0.90%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
4 Aug 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66803 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-66803), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.