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TI-2026-39027 Aliases CVE-2026-54100GHSA-q3jf-4x8j-368q

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

Priority LOW 38CWE-295Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Spoofing
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 4 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-295.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00303 23rd percentileScored 2026-11-07
Fix Partial Red Hat: 4 advisoriesRed Hat: 4 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat OpenShift for Windows Containers 10.19—1789075615Patch availableCNA
Red HatRed Hat OpenShift for Windows Containers 10.20—1789075603Patch availableCNA
Red HatRed Hat OpenShift for Windows Containers 10.21—1787065708Patch availableCNA
Red HatRed Hat OpenShift for Windows Containers 10.22—1783692800Patch availableCNA
Red HatRed Hat OpenShift Container Platform 4——No fix listedCNA
Red HatRed Hat OpenShift Container Platform 4——No fix listedCNA
  • Red Hat OpenShift for Windows Containers 10.19 VendorRed Hat Affected — Fixed in 1789075615 Patch available CNA
  • Red Hat OpenShift for Windows Containers 10.20 VendorRed Hat Affected — Fixed in 1789075603 Patch available CNA
  • Red Hat OpenShift for Windows Containers 10.21 VendorRed Hat Affected — Fixed in 1787065708 Patch available CNA
  • Red Hat OpenShift for Windows Containers 10.22 VendorRed Hat Affected — Fixed in 1783692800 Patch available CNA
  • Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*4.0 – 4.22.1VulnerableRed Hat
cpe:2.3:a:redhat:windows_machine_config_operator:-:*:*:*:*:*:*:*not specified by NVDVulnerableRed Hat
  • cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:* Versions 4.0 – 4.22.1 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:windows_machine_config_operator:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Red Hat

Remediation

Red Hat 4 advisories

  • RHSA-2026:82440 Released 2026-10-13 · Red Hat rating Important
    Red Hat OpenShift for Windows Containers 10.20.2 product release
    • Red Hat OpenShift for Windows Containers 10.20 registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator
  • RHSA-2026:81397 Released 2026-10-12 · Red Hat rating Important
    Red Hat OpenShift for Windows Containers 10.19.3 product release
    • Red Hat OpenShift for Windows Containers 10.19 registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator
  • RHSA-2026:61780 Released 2026-08-31 · Red Hat rating Important
    Red Hat OpenShift for Windows Containers 10.21.2 product release
    • Red Hat OpenShift for Windows Containers 10.21 registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator
Show 1 more Red Hat advisories
  • RHSA-2026:47173 Released 2026-07-28 · Red Hat rating Important
    Red Hat OpenShift for Windows Containers 10.22.1 product release
    • Red Hat OpenShift for Windows Containers 10.22 registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Red Hat OpenShift Container Platform 4, Red Hat OpenShift for Windows Containers 10.19 and 3 more products — RHSA-2026:47173

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-39026 Improper privilege management in Red Hat OpenShift for Windows Containers 10.19Priority LOW 39
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat OpenShift Container Platform 4, Red Hat OpenShift for Windows Containers 10.19 and 3 more products — RHSA-2026:61780

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-39026 Improper privilege management in Red Hat OpenShift for Windows Containers 10.19Priority LOW 39
    Show all 2 records → Advisory →
Show 2 more groups
  • Advisory ·

    Red Hat OpenShift Container Platform 4, Red Hat OpenShift for Windows Containers 10.19 and 3 more products — RHSA-2026:81397

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-39026 Improper privilege management in Red Hat OpenShift for Windows Containers 10.19Priority LOW 39
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat OpenShift Container Platform 4, Red Hat OpenShift for Windows Containers 10.19 and 3 more products — RHSA-2026:82440

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-39026 Improper privilege management in Red Hat OpenShift for Windows Containers 10.19Priority LOW 39
    Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenShift Container Platform 4AffectedNo fix yet
Red Hat OpenShift for Windows Containers 10.19Fixed RHSA-2026:81397
Red Hat OpenShift for Windows Containers 10.20Fixed RHSA-2026:82440
Red Hat OpenShift for Windows Containers 10.21Fixed RHSA-2026:61780
Red Hat OpenShift for Windows Containers 10.22Fixed RHSA-2026:47173
Not affected: 4 products
  • Red Hat OpenShift for Windows Containers 10.19
  • Red Hat OpenShift for Windows Containers 10.20
  • Red Hat OpenShift for Windows Containers 10.21
  • Red Hat OpenShift for Windows Containers 10.22

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54100
  2. 2026-10-03 Alias added: GHSA-q3jf-4x8j-368q
  3. 2026-10-12 Fix available: openshift4-wincw/windows-machine-config-rhel9-operator@1789075615 · CNA
  4. 2026-10-12 1 new reference · CNA
  5. 2026-10-13 Fix available: RHSA-2026:81397 · Red Hat
  6. 2026-10-13 Fix available: Red Hat OpenShift for Windows Containers 10.19 · Red Hat
  7. 2026-10-14 Fix available: RHSA-2026:82440 · Red Hat
  8. 2026-10-14 Fix available: openshift4-wincw/windows-machine-config-rhel9-operator@1789075603 · CNA
  9. 2026-10-14 1 new reference · CNA
  10. 2026-10-15 Fix available: Red Hat OpenShift for Windows Containers 10.20 · Red Hat

References

Advisory 7

  • TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-34021 Linux kernel skb coalescing drops shared-frag marker KEVCVSS 3.1HIGH 7.8
  • TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
See all 340 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences