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CVE Record

CVE-2026-54100: Windows-machine-config-operator: windows-machine-config-operator: ssh host key not verified enables credential theft

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.

HighCVSS 8.3Not KEV-listedUpdated
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Potential ATT&CK relevance

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ATT&CK lookup starting points

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CWE-295: Exact CWE lookup

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Credential and access behavior lookup

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Container behavior lookup

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CVE-2026-54100 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
2ADP providers
8Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.3CVSS 3.1HighCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H1.66redhat
8.3CVSS 3.1HighCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H1.66redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8.3High
CVSS 3.1 vector shape for CVE-2026-54100Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. ADP timelineredhat-SADP

    Made public.

  2. Source timelineredhat

    Made public.

  3. ADP timelineredhat-SADP

    Reported to Red Hat.

  4. Source timelineredhat

    Reported to Red Hat.

  5. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  6. CVE publishedCVE Program

    The CVE record was published.

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPwindows-machine-config-operator: windows-machine-config-operator: SSH host key not verified enables credential theft
other:Red Hat severity ratingcvssV3_1
  • 2026-06-11T00:00:00.000Z: Reported to Red Hat.
  • 2026-06-10T00:00:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat OpenShift for Windows Containers 10.19openshift4-wincw/windows-machine-config-rhel9-operator, 1789075615affected
Red HatRed Hat OpenShift for Windows Containers 10.20openshift4-wincw/windows-machine-config-rhel9-operator, 1789075603affected
Red HatRed Hat OpenShift for Windows Containers 10.21openshift4-wincw/windows-machine-config-rhel9-operator, 1787065708affected
Red HatRed Hat OpenShift for Windows Containers 10.22openshift4-wincw/windows-machine-config-rhel9-operator, 1783692800affected
Red HatRed Hat OpenShift Container Platform 4openshift4-wincw/windows-machine-config-rhel8-operatoraffected
Red HatRed Hat OpenShift Container Platform 4openshift4-wincw/windows-machine-config-rhel9-operatoraffected
Weakness

CWE details

CWE-295

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-295 · source CWE mapping

Improper Certificate Validation

Improper Certificate Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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