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HIGH

CVE-2026-66793

CVSS v3

8.8

HIGH

EPSS Score

0.8 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-66793 Red Hat Product Security24 products fixed

    governance-policy-addon-controller: governance-policy-addon-controller: arbitrary container image override via ManagedClusterAddOn annotation enables RCE on spoke

  • RHSA-2026:60391 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.16.4 security update

  • RHSA-2026:60390 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.13.11 security update

  • RHSA-2026:60388 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.14.4 security update

  • RHSA-2026:60389 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.15.6 security update

  • RHSA-2026:60387 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.11.11 security update

1 more advisory

Full record on 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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2026-08-18
Last Modified
2026-08-18

Frequently asked questions

What is 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.

Is CVE-2026-66793 actively exploited?

Active exploitation of CVE-2026-66793 has not been confirmed. Its EPSS score was 0.8% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-66793?

CVE-2026-66793 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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