CVE-2026-10090
A flaw was found in the Application Subscription controller (multicluster-operators-subscription) of Red Hat Advanced Cluster Management for Kubernetes (ACM). A user with namespace-scoped "edit" privileges in an ACM hub namespace can create a Channel resource pointing to a Helm repository they control and a Subscription resource referencing it. The app-subscription controller fetches and applies the Helm chart contents with its own elevated authority, without verifying whether the subscription creator holds the "open-cluster-management:subscription-admin" role and without restricting applied resources to the subscription namespace. This allows the attacker to include cluster-scoped resources in the Helm chart, such as a ClusterRoleBinding granting the attacker's ServiceAccount the "cluster-admin" ClusterRole. Successful exploitation results in full cluster-admin privilege escalation. This contradicts the ACM documentation which states that non-subscription-admin users should have resources deployed into the subscription namespace only.
Scoring
- Severity
- CRITICAL
- CVSS base score
- 9
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L
- EPSS probability
- 0.36%
- CWE
- CWE-267
- Published
- 2026-08-05
- Last modified
- 2026-09-08
Affected products
- Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13
- Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.15
- Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17
- Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.11
- Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14
- Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16
- Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14.0
Weakness type
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