CVE-2026-54099

Windows-machine-config-operator: windows-machine-config-operator: wicd csr extra-organization allows privilege escalation to system:masters

publishedCWE-269

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.

Technical severity8.8 highCVSS 3.1 · CNA: redhat

Published2026-06-22Source updated 2026-11-04

Collected2026-11-042 attributed sources

Fixes and workarounds

Workaround

At this time, no mitigation or workaround is available for this vulnerability. Customers are advised to apply the appropriate updates as they become available.

Source: CNA: redhat

Fix

RHSA-2026:61780: Red Hat OpenShift for Windows Containers 10.21 RHSA-2026:47173: Red Hat OpenShift for Windows Containers 10.22

Source: ADP: redhat-SADP

Workaround

At this time, no mitigation or workaround is available for this vulnerability. Customers are advised to apply the appropriate updates as they become available.

Source: ADP: redhat-SADP

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Red Hat OpenShift for Windows Containers 10.19 Red Hat `openshift4-wincw/windows-machine-config-rhel9-operator` https://catalog.redhat.com/software/containers/	≥ 1789075615; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat OpenShift for Windows Containers 10.20 Red Hat `openshift4-wincw/windows-machine-config-rhel9-operator` https://catalog.redhat.com/software/containers/	≥ 1789075603; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat OpenShift for Windows Containers 10.21 Red Hat `openshift4-wincw/windows-machine-config-rhel9-operator` https://catalog.redhat.com/software/containers/	≥ 1787065708; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat OpenShift for Windows Containers 10.22 Red Hat `openshift4-wincw/windows-machine-config-rhel9-operator` https://catalog.redhat.com/software/containers/	≥ 1783692800; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat OpenShift for Windows Containers 11.0 Red Hat `openshift4-wincw/windows-machine-config-rhel9-operator` https://catalog.redhat.com/software/containers/	≥ 1793279001; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat OpenShift Container Platform 4 Red Hat `openshift4-wincw/windows-machine-config-rhel8-operator` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat OpenShift Container Platform 4 Red Hat `openshift4-wincw/windows-machine-config-rhel9-operator` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat OpenShift for Windows Containers 10.21 Red Hat `openshift4-wincw/windows-machine-config-rhel9-operator` https://catalog.redhat.com/software/containers/	≥ 1787065708; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat OpenShift for Windows Containers 10.22 Red Hat `openshift4-wincw/windows-machine-config-rhel9-operator` https://catalog.redhat.com/software/containers/	≥ 1783692800; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat OpenShift Container Platform 4 Red Hat `openshift4-wincw/windows-machine-config-rhel8-operator` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	ADP: redhat-SADP
Red Hat OpenShift Container Platform 4 Red Hat `openshift4-wincw/windows-machine-config-rhel9-operator` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	ADP: redhat-SADP

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 8.8 high	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`	CNA: redhat
3.1 / 8.8 high	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`	ADP: redhat-SADP

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://access.redhat.com/errata/RHSA-2026:47173CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:61780CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:81397CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:82440CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:94562CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-54099CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2487950CNA: redhat · issue-tracking, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-54099ADP: redhat-SADP · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2487950ADP: redhat-SADP · issue-tracking, x_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54099.jsonADP: redhat-SADP · x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:61780ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47173ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT

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