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CriticalVulnerabilityCVE-2026-83938updated 25 Oct 2026, 17:05 UTC

Azure Kubernetes Configuration Service lets outsiders gain higher privileges

A management service for Azure Kubernetes clusters does not check who is asking before doing a sensitive task. Someone on the network with no login could use this to take on higher-level control.

Official, 3 sources
SeverityCriticalCVSS 10 of 10
Being exploited?Not knownNo attacks reported so far
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 3 sourcesBacked by an official source

What happened

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

Why it is dangerous: An attacker who can reach the service could gain elevated privileges over affected Kubernetes configuration, potentially affecting cluster operations. Organizations running Azure Kubernetes services are at risk.

Are you affected?

You are affected if you run the Azure Kubernetes Configuration Service in your Azure environment and it is reachable over a network from untrusted sources.

Azure Kubernetes Configuration Service (specific versions unknown)

What to do

  1. Check the Microsoft MSRC advisory for CVE-2026-83938 for the affected service versions and the official fix or mitigation
  2. Apply the Microsoft-provided update or mitigation to the Azure Kubernetes Configuration Service as soon as possible
  3. Restrict network access to the service to trusted sources until the fix is applied
  4. Review Azure activity and cluster logs for unexpected privilege changes

Timeline

  1. 22 Oct 2026, 14:00 UTC
    Publicly disclosed
  2. 22 Oct 2026, 14:00 UTC
    Reported by Microsoft MSRC · Microsoft MSRC
  3. 22 Oct 2026, 22:19 UTC
    Reported by NVD · NVD
  4. 25 Oct 2026, 17:05 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 3 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-83938 · GHSA-2vxx-fgvw-2r33
CVSS
10 / 10
EPSS
0.7% chance of exploitation within 30 days
Disclosed
22 Oct 2026, 14:00 UTC
On Zero Radar
before the radar started
Last change
25 Oct 2026, 17:05 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

Azure Kubernetes Configuration Service lets outsiders gain higher privileges · Zero Radar