CVE-2026-66793 Privilege escalation in Red Hat Advanced Cluster Management for Kubernetes 2.11
An attacker with annotation permissions can override container images to execute arbitrary code with cluster-admin privileges on managed clusters.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66793?
CVE-2026-66793 is a high-severity vulnerability in Red Hat Advanced Cluster Management for Kubernetes 2.11, published on 18 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in the governance-policy-addon-controller component of Red Hat Advanced Cluster Management for Kubernetes. A user with permissions to annotate the namespaced ManagedClusterAddOn resource can override the governance-policy container image. This allows an attacker to run a controlled image with cluster-admin privileges on the managed cluster, leading to arbitrary code execution and privilege escalation.
Weakness: CWE-20
Which versions are affected by CVE-2026-66793?
How do I fix CVE-2026-66793?
No fix has been published for CVE-2026-66793 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-66793 being exploited?
There is no known exploitation of CVE-2026-66793 in the wild and no public exploit code.
Sources
Also known as GHSA-xh6j-xcjj-j38g.