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Advisory severityHigh8.8Red Hat Linux

High [CVE-2026-66793] arbitrary container image override via ManagedClusterAddOn annotation enables RCE on spoke

This high-severity Red Hat Linux advisory covers CVE-2026-66793 affecting Red Hat Advanced Cluster Management for Kubernetes 2.11, Red Hat Advanced Cluster Management for Kubernetes 2.13, Red Hat Advanced Cluster Management for Kubernetes 2.14.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-66793 Source published Source updated

VulniPulse record published Record updated

CVE-2026-66793
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

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. This Critical vulnerability in Red Hat Advanced Cluster Management for Kubernetes enables remote code execution on managed clusters.

Red Hat severity: Important — CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-20.

Red Hat fixing advisory: RHSA-2026:60387, RHSA-2026:60390, RHSA-2026:60388, RHSA-2026:60389, RHSA-2026:60391, RHSA-2026:60386.

Affected products named by the advisory: Red Hat Advanced Cluster Management for Kubernetes 2.11; Red Hat Advanced Cluster Management for Kubernetes 2.13; Red Hat Advanced Cluster Management for Kubernetes 2.14; Red Hat Advanced Cluster Management for Kubernetes 2.15; and 2 more.

Affected products named by the advisory: Red Hat Advanced Cluster Management for Kubernetes 2.16; Red Hat Advanced Cluster Management for Kubernetes 2.17.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 22 days ago·verify at source

Fixed versions
  • rhacm2/acm-governance-policy-addon-controller-rhel9:1787683327
  • rhacm2/acm-governance-policy-addon-controller-rhel9:1787259078
  • rhacm2/acm-governance-policy-addon-controller-rhel9:1787080755
  • rhacm2/acm-governance-policy-addon-controller-rhel9:1787238535
  • rhacm2/acm-governance-policy-addon-controller-rhel9:1787080753
  • rhacm2/acm-governance-policy-addon-controller-rhel9:1787227696
  • RHSA-2026:60387
  • RHSA-2026:60390
  • RHSA-2026:60388
  • RHSA-2026:60389
  • RHSA-2026:60391
  • RHSA-2026:60386

Official advisory · high-confidence parse· fetched 22 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • To mitigate this issue, restrict users' ability to annotate ManagedClusterAddOn resources within the hub cluster. Ensure that only trusted administrators have namespace-level annotate permissions on these resources. Regularly review and audit permissions related to ManagedClusterAddOn resources to prevent unauthorized modifications. If a service is restarted or reloaded, these permission changes will persist.

Official advisory · high-confidence parse· fetched 22 days ago·verify at source

Discussion(0)

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