CVE-2026-54100

Credential theft via unverified SSH host keys

Published Jun 22, 2026 · Updated Jun 22, 2026

Improper SSH host-key validation in Red Hat WMCO allows adjacent-network attackers to steal Windows node bootstrap credentials. WMCO opens SSH sessions to Windows workers without validating the server host key, then transfers WICD and kubelet bootstrap credentials over those sessions. Exploitation requires WMCO, at least one Windows worker, network-path control, and favorable timing; stolen credentials enable Windows node-identity compromise.

CVSS severity8.3
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper SSH host-key validation in Red Hat WMCO allows adjacent-network attackers to steal Windows node bootstrap credentials. WMCO opens SSH sessions to Windows workers without validating the server host key, then transfers WICD and kubelet bootstrap credentials over those sessions. Exploitation requires WMCO, at least one Windows worker, network-path control, and favorable timing; stolen credentials enable Windows node-identity compromise.

The record

CVE
CVE-2026-54100
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
389 Directory Server
Product
Red Hat OpenShift for Windows Containers
Classifications
CWE-295, T1557
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat OpenShift for Windows ContainersAffected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container PlatformAffected versions are unavailable in this record.

Published CVSS scores

8.3Red HatCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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