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Fencer Vulns
high 8.8

CVE-2026-54099 json

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

published 2026-06-22 4 mo ago modified 2026-11-04 5 d ago also EUVD-2026-38233

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat OpenShift for Windows Containers 10.19 1789075615
  • Red Hat Red Hat OpenShift for Windows Containers 10.20 1789075603
  • Red Hat Red Hat OpenShift for Windows Containers 10.21 1787065708
  • Red Hat Red Hat OpenShift for Windows Containers 10.22 1783692800
  • Red Hat Red Hat OpenShift for Windows Containers 11.0 1793279001

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-54099 updated cvss 8.8

windows-machine-config-operator: windows-machine-config-operator: WICD CSR extra-Organization allows privilege escalation to system:masters

  • Red Hat OpenShift Container Platform 4 openshift4-wincw/windows-machine-config-rhel8-operator, openshift4-wincw/windows-machine-config-rhel9-operator
    affected: workaround, no fix available “At this time, no mitigation or workaround is available for this vulnerability. Customers are advised to apply the appropriate updates as they become available.”
  • Red Hat OpenShift for Windows Containers 10.19 openshift4-wincw/windows-machine-config-rhel9-operator 1789075615
    fixed: vendor fix “At this time, no mitigation or workaround is available for this vulnerability. Customers are advised to apply the appropriate updates as they become available.” RHSA-2026:81397
  • Red Hat OpenShift for Windows Containers 10.20 openshift4-wincw/windows-machine-config-rhel9-operator 1789075603
    fixed: vendor fix “At this time, no mitigation or workaround is available for this vulnerability. Customers are advised to apply the appropriate updates as they become available.” RHSA-2026:82440
  • Red Hat OpenShift for Windows Containers 10.21 openshift4-wincw/windows-machine-config-rhel9-operator 1787065708
    fixed: vendor fix “At this time, no mitigation or workaround is available for this vulnerability. Customers are advised to apply the appropriate updates as they become available.” RHSA-2026:61780
  • Red Hat OpenShift for Windows Containers 10.22 openshift4-wincw/windows-machine-config-rhel9-operator 1783692800
    fixed: vendor fix “At this time, no mitigation or workaround is available for this vulnerability. Customers are advised to apply the appropriate updates as they become available.” RHSA-2026:47173
  • Red Hat OpenShift for Windows Containers 11.0 openshift4-wincw/windows-machine-config-rhel9-operator 1793279001
    fixed: vendor fix “At this time, no mitigation or workaround is available for this vulnerability. Customers are advised to apply the appropriate updates as they become available.” RHSA-2026:94562
  • Red Hat OpenShift for Windows Containers 10.19 openshift4-wincw/windows-machine-config-operator-bundle 1789078443 Red Hat OpenShift for Windows Containers 10.20 openshift4-wincw/windows-machine-config-operator-bundle 1789078436 Red Hat OpenShift for Windows Containers 10.21 openshift4-wincw/windows-machine-config-operator-bundle 1787070158 Red Hat OpenShift for Windows Containers 10.22 openshift4-wincw/windows-machine-config-operator-bundle 1783955949 Red Hat OpenShift for Windows Containers 11.0 openshift4-wincw/windows-machine-config-operator-bundle 1793282060
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
4 mo ago

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADP 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat OpenShift for Windows Containers 10.19
  • Red Hat Red Hat OpenShift for Windows Containers 10.20
  • Red Hat Red Hat OpenShift for Windows Containers 10.21
  • Red Hat Red Hat OpenShift for Windows Containers 10.22
  • Red Hat Red Hat OpenShift for Windows Containers 11.0
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness
  • CWE-269 Improper Privilege Management

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.