What is CVE-2026-66793?

CVE-2026-66793 is a high-severity vulnerability in Red Hat Advanced Cluster Management For Kubernetes 2, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2026-08-18.

How severe is CVE-2026-66793?

High severity. CVSS v3 base score is 8.8 out of 10.

Improper input validation in Red Hat Advanced Cluster Management For Kubernetes 2

CVE-2026-66793

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Red Hat Advanced Cluster Management For Kubernetes 2

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking)

Frequently asked questions

What is CVE-2026-66793?: CVE-2026-66793 is a high-severity vulnerability in Red Hat Advanced Cluster Management For Kubernetes 2, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2026-08-18.
How severe is CVE-2026-66793?: High severity. CVSS v3 base score is 8.8 out of 10.