CyberSecBulletin
CVE-2026-54100NVD status: Modified

Red Hat OpenShift for Windows Containers 10.19: Improper Certificate Validation

Published Updated By the CyberSecBulletin desk

CVE-2026-54100 is a high-severity improper certificate validation vulnerability in Red Hat OpenShift for Windows Containers 10.19 from Red Hat, with a CVSS 3.1 base score of 8.3 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 0.3% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Check which version of Red Hat OpenShift for Windows Containers 10.19 you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on access.redhat.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
Red HatRed Hat OpenShift for Windows Containers 10.19Not specified in the recordNot stated
Red HatRed Hat OpenShift for Windows Containers 10.20Not specified in the recordNot stated
Red HatRed Hat OpenShift for Windows Containers 10.21Not specified in the recordNot stated
Red HatRed Hat OpenShift for Windows Containers 10.22Not specified in the recordNot stated
Red HatRed Hat OpenShift Container Platform 4Not specified in the recordNot stated
Red HatOpenshift Container Platform4.0 through 4.22.1Not stated
Red HatWindows Machine Config OperatorNot specified in the recordNot stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
AdjacentThe attacker must be on the same local network segment.
Attack complexity
HighSuccess depends on conditions outside the attacker's control.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
ChangedThe attack can reach beyond the vulnerable component into other systems.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H. Scored by CNA (redhat.com).

Scoring systemScoreSeverityScored by
CVSS 3.18.3HighCNA (redhat.com)
CVSS 3.18.3HighCNA

Official description

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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Certificate Validation

The product does not validate, or incorrectly validates, a certificate.

How developers prevent this class of flaw

  • Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
  • If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.

More Improper Certificate Validation vulnerabilities (CWE-295)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Red Hat OpenShift for Windows Containers 10.19

All Red Hat OpenShift for Windows Containers 10.19 vulnerabilities

Recent Improper Certificate Validation vulnerabilities

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