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Vulnerability record · CVE-2026-66793 · published 18 August 2026

CVE-2026-66793: Improper input validation vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.81% · top 44.8% CWE-20 · Improper input validation Awaiting Analysis
8.8CVSS 3.1 base score
0.81%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
27 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:60386
https://access.redhat.com/errata/RHSA-2026:60387
https://access.redhat.com/errata/RHSA-2026:60388
https://access.redhat.com/errata/RHSA-2026:60389
https://access.redhat.com/errata/RHSA-2026:60390
https://access.redhat.com/errata/RHSA-2026:60391
https://access.redhat.com/security/cve/CVE-2026-66793
https://bugzilla.redhat.com/show_bug.cgi?id=2507538

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Source: NIST National Vulnerability Database (record CVE-2026-66793), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.