High · published June 22, 2026
A flaw was found in the Windows Machine Config Operator (WMCO) for Red Hat OpenShift Container Platform. The WICD CSR auto-approver validates that a Certificate Signing Request contains the organization system:wicd-nodes but does not reject additional organization values such as system:masters. A compromised Windows worker node that holds WICD credentials can submit a CSR that is auto-approved and signed by the cluster, yielding a client certificate that grants cluster-administrator privileges and enabling full cluster takeover.
| Product | Versions | Fixed in |
|---|---|---|
| redhat/openshift_container_platform | ≥ 4.0, < 4.22.1 | 4.22.1 |
| redhat/windows_machine_config_operator | all versions | — |