Red Hat Advanced Cluster Management for Kubernetes Application Subscription controller privileges management

Summaryinfo

A vulnerability labeled as very critical has been found in Red Hat Advanced Cluster Management for Kubernetes. Affected by this vulnerability is an unknown functionality of the component Application Subscription controller. Such manipulation leads to privileges management. This vulnerability is traded as CVE-2026-10090. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Red Hat Advanced Cluster Management for Kubernetes (the affected version unknown). It has been rated as very critical. Affected by this issue is an unknown part of the component Application Subscription controller. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at access.redhat.com. This vulnerability is handled as CVE-2026-10090 since 05/29/2026. The exploitation is known to be easy. The attack may be launched remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 08/05/2026). The MITRE ATT&CK project declares the attack technique as T1068.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Virtualization Software

Vendor

• Red Hat

Name

• Advanced Cluster Management for Kubernetes

License

• open-source

Website

• Vendor: https://www.redhat.com/

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