Skip to content
Fencer Vulns
high 8.3

CVE-2026-54100 json

Windows-machine-config-operator: windows-machine-config-operator: ssh host key not verified enables credential theft

published 2026-06-22 4 mo ago modified 2026-10-14 26 d ago also EUVD-2026-38234

cvss
8.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

A flaw was found in the Windows Machine Config Operator (WMCO) for Red Hat OpenShift Container Platform. WMCO establishes SSH connections to Windows worker nodes without verifying the remote server host key. An adjacent-network attacker who can intercept or redirect WMCO's SSH session can capture WICD and kubelet bootstrap credentials transferred during node configuration, enabling compromise of Windows node identities in the cluster.

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

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-2026-54100 updated cvss 8.3

windows-machine-config-operator: windows-machine-config-operator: SSH host key not verified enables credential theft

  • 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 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
    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

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.3 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADP 3.1 8.3 CVSS:3.1/AV:A/AC:H/PR:N/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 Container Platform 4

Classification

Weakness
  • CWE-295 Improper Certificate Validation

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.