جزئیات آسیب‌پذیری

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.

• https://access.redhat.com/errata/RHSA-2026:60386 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:60387 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:60388 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:60389 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:60390 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2026:60391 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/security/cve/CVE-2026-10090 vdb-entryx_refsource_REDHAT
• https://bugzilla.redhat.com/show_bug.cgi?id=2483292 issue-trackingx_refsource_REDHAT