CVE-2026-73268: Cluster-curator-controller: cluster-curator-controller: spec.install.overridejob allows arbitrary job spec injection

Severity: critical (CVSS 9.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% 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-94

Description

A flaw was found in the cluster-curator-controller component of multicluster engine (MCE). A tenant with create or update permissions on ClusterCurator resources can inject an arbitrary Job specification. This is possible because the CreateJob() function does not validate user-controlled input when unmarshaling the spec.install.overrideJob raw extension. Successful exploitation allows the injected Job to run with the controller's elevated privileges, leading to arbitrary code execution and privilege escalation, potentially accessing cluster-wide secrets.

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

Get alerted when CVE-2026-73268 or the next vulnerability affects your stack