8.8High
CVE-2026-54099Windows-machine-config-operator: windows-machine-config-operator: wicd csr extra-organization allows privilege escalation to system:masters
Description
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.
Weakness (CWE):
CWE-269
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| redhat | openshift container platform | 4.0 – < 4.22.1 | |
| Red Hat | Red Hat OpenShift Container Platform 4 | all versions | |
| Red Hat | Red Hat OpenShift for Windows Containers 10.19 | all versions | |
| Red Hat | Red Hat OpenShift for Windows Containers 10.20 | all versions | |
| Red Hat | Red Hat OpenShift for Windows Containers 10.21 | all versions | |
| Red Hat | Red Hat OpenShift for Windows Containers 10.22 | all versions | |
| Red Hat | Red Hat OpenShift for Windows Containers 11.0 | all versions | |
| redhat | windows machine config operator | — | |
| windows machine config | 10.19 | — | |
| windows machine config | 10.20 | — | |
| windows machine config | 10.21 | — | |
| windows machine config | 10.22 | — | |
| windows machine config | 11.0 | — |
References and patches
- RHSA-2026:47173 vendor-advisory
- RHSA-2026:61780 vendor-advisory
- RHSA-2026:81397 vendor-advisory
- RHSA-2026:82440 vendor-advisory
- RHSA-2026:94562 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-54099 vdb-entryVendor Advisory
- RHBZ#2487950 issue-trackingIssue TrackingVendor Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54099.json Vendor Advisory
CPE matches (NVD) (2)
cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*≥ 4.0 < 4.22.1cpe:2.3:a:redhat:windows_machine_config_operator:-:*:*:*:*:*:*:*