What is CVE-2026-85889?

CVE-2026-85889 is a critical-severity vulnerability in Microsoft Azure Ai Foundry, classified under Missing Authentication for Critical Function. CVSS score: 10.0/10. Published 2026-09-17.

How severe is CVE-2026-85889?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Auth bypass in Microsoft Azure Ai Foundry

CVE-2026-85889

Missing authentication for critical function in Azure AI Foundry allows an unauthorized attacker to elevate privileges over a network.

Vulnerability class: Broken Authentication

Published 2026-09-17 · last modified 2026-09-25.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (52.0th percentile), scored 2026-11-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.0% 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-306 — Missing Authentication for Critical Function

References

Azure AI Foundry Elevation of Privilege Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-85889?: CVE-2026-85889 is a critical-severity vulnerability in Microsoft Azure Ai Foundry, classified under Missing Authentication for Critical Function. CVSS score: 10.0/10. Published 2026-09-17.
How severe is CVE-2026-85889?: Critical severity. CVSS v3 base score is 10.0 out of 10.