Critical [CVE-2026-66792] IsClusterAdmin trusts user-settable annotations on managed clusters
This critical-severity Red Hat Linux advisory covers CVE-2026-66792 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.
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Summary
A flaw was found in the multicloud-operators-subscription component. This vulnerability allows a user on a managed cluster to escalate their privileges by creating a Subscription with specific, crafted annotations.
Successful exploitation grants the attacker the ability to deploy resources into any namespace with the elevated permissions of the controller's Service Account, potentially leading to unauthorized access and control over cluster resources.
Critical: This flaw in Red Hat Advanced Cluster Management for Kubernetes allows a privileged user on a managed cluster to escalate privileges to cluster-admin. Red Hat severity: Important — CVSS 9.9 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).
Weakness: CWE-863.
Affected Red Hat products: 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; Red Hat Advanced Cluster Management for Kubernetes 2.16; Red Hat Advanced Cluster Management for Kubernetes 2.17; Multicluster Global Hub; Red Hat OpenShift Container Platform 4.
Will not fix / out of support: Multicluster Global Hub; Red Hat OpenShift Container Platform 4. Red Hat fixing advisory: RHSA-2026:60387, RHSA-2026:60390, RHSA-2026:60388, RHSA-2026:60389, RHSA-2026:60391, RHSA-2026:60386.
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 19 days ago·verify at source
- rhacm2/multicluster-operators-application-rhel9:1787262214
- rhacm2/multicluster-operators-subscription-rhel9:1787263584
- rhacm2/multicluster-operators-application-rhel9:1787259284
- rhacm2/multicluster-operators-subscription-rhel9:1787263693
- rhacm2/multicluster-operators-application-rhel9:1786976940
- rhacm2/multicluster-operators-subscription-rhel9:1787170830
- rhacm2/multicluster-operators-application-rhel9:1787238598
- rhacm2/multicluster-operators-subscription-rhel9:1787240030
- rhacm2/multicluster-operators-application-rhel9:1787242135
- rhacm2/multicluster-operators-subscription-rhel9:1787242321
- rhacm2/multicluster-operators-application-rhel9:1787242131
- rhacm2/multicluster-operators-subscription-rhel9:1787242108
- RHSA-2026:60387
- RHSA-2026:60390
- RHSA-2026:60388
- RHSA-2026:60389
- RHSA-2026:60391
- RHSA-2026:60386
Official advisory · high-confidence parse· fetched 19 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 19 days ago·verify at source
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