What is CVE-2026-24304?

CVE-2026-24304 is a critical-severity vulnerability in Microsoft Azure Cosmos Db, classified under Improper Access Control. CVSS score: 9.9/10. Published 2026-01-23.

How severe is CVE-2026-24304?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Vulnerability in Microsoft Azure Cosmos Db

CVE-2026-24304

Improper access control in Azure Resource Manager allows an authorized attacker to elevate privileges over a network.

Published 2026-01-23 · last modified 2026-07-30.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.9th percentile), scored 2026-11-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: -0.000

Affected products

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-24304 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-24304?: CVE-2026-24304 is a critical-severity vulnerability in Microsoft Azure Cosmos Db, classified under Improper Access Control. CVSS score: 9.9/10. Published 2026-01-23.
How severe is CVE-2026-24304?: Critical severity. CVSS v3 base score is 9.9 out of 10.