CVE-2026-10090
Last modified
CVE-2026-10090 is a critical-severity vulnerability rated 9/10 on the CVSS scale. 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. EPSS estimates a 0.58% chance of exploitation in the next 30 days.
Description
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.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.11 | All versions |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.13 | All versions |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.14 | All versions |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.15 | All versions |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.16 | All versions |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
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