CVE-2026-73269: Cluster-curator-controller: cluster-curator-controller: tenant-controllable trigger creates clusterrolebinding granting cluster-wide secrets access to namespace-local sa

Severity: critical (CVSS 9.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-12 · updated 2026-10-24
Weakness: CWE-269

Description

A flaw was found in the cluster-curator-controller component. A local user, by creating a ClusterCurator resource with a specific naming convention, can trigger the creation of a cluster-scoped ClusterRoleBinding. This allows the user to escalate their privileges from namespace-local access to cluster-wide control. This privilege escalation grants broad permissions, including the ability to access and manipulate secrets, manage cluster actions, and delete hosted clusters or node pools.

Affected products

Red Hat multicluster engine for Kubernetes 2.10: all versions — fixed in 1787201612
Red Hat multicluster engine for Kubernetes 2.11: all versions — fixed in 1787238383
Red Hat multicluster engine for Kubernetes 2.17: all versions — fixed in 1786750700
Red Hat multicluster engine for Kubernetes 2.6: all versions — fixed in 1787264185
Red Hat multicluster engine for Kubernetes 2.8: all versions — fixed in 1787259011
Red Hat multicluster engine for Kubernetes 2.9: all versions — fixed in 1787201646

How to fix

Upgrade to a fixed version: Red Hat multicluster engine for Kubernetes 2.10 1787201612; Red Hat multicluster engine for Kubernetes 2.11 1787238383; Red Hat multicluster engine for Kubernetes 2.17 1786750700; Red Hat multicluster engine for Kubernetes 2.6 1787264185; Red Hat multicluster engine for Kubernetes 2.8 1787259011; Red Hat multicluster engine for Kubernetes 2.9 1787201646. Check the vendor advisory for mitigations.

References

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