What is CVE-2026-83938?

CVE-2026-83938 is a critical-severity vulnerability in Microsoft Azure Kubernetes Configuration Service, classified under Missing Authentication for Critical Function. CVSS score: 10.0/10. Published 2026-10-22.

How severe is CVE-2026-83938?

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

Auth bypass in Microsoft Azure Kubernetes Configuration Service

CVE-2026-83938

Missing authentication for critical function in Azure Kubernetes Configuration Service allows an unauthorized attacker to elevate privileges over a network.

Vulnerability class: Broken Authentication

Published 2026-10-22 · last modified 2026-10-23.

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

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Microsoft Azure Kubernetes Configuration Service

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

Azure Kubernetes Configuration Service Elevation of Privilege Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-83938?: CVE-2026-83938 is a critical-severity vulnerability in Microsoft Azure Kubernetes Configuration Service, classified under Missing Authentication for Critical Function. CVSS score: 10.0/10. Published 2026-10-22.
How severe is CVE-2026-83938?: Critical severity. CVSS v3 base score is 10.0 out of 10.