CVE-2026-54099
Full vulnerability record from the local CVENow database.
Description
A flaw was found in the Windows Machine Config Operator (WMCO) for Red Hat OpenShift Container Platform. The WICD CSR auto-approver validates that a Certificate Signing Request contains the organization system:wicd-nodes but does not reject additional organization values such as system:masters. A compromised Windows worker node that holds WICD credentials can submit a CSR that is auto-approved and signed by the cluster, yielding a client certificate that grants cluster-administrator privileges and enabling full cluster takeover.
Severity
HIGH
CVSS score
8.8
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-06-22 14:17:40.820000
Last modified
2026-11-04 06:17:05.153000
View original CVE JSON
{
"id": "CVE-2026-54099",
"sourceIdentifier": "[email protected]",
"published": "2026-06-22T14:17:40.820",
"lastModified": "2026-11-04T06:17:05.153",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in the Windows Machine Config Operator (WMCO) for Red Hat OpenShift Container Platform. The WICD CSR auto-approver validates that a Certificate Signing Request contains the organization system:wicd-nodes but does not reject additional organization values such as system:masters. A compromised Windows worker node that holds WICD credentials can submit a CSR that is auto-approved and signed by the cluster, yielding a client certificate that grants cluster-administrator privileges and enabling full cluster takeover."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift for Windows Containers 10.19",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "openshift4-wincw/windows-machine-config-rhel9-operator",
"cpes": [
"cpe:/a:redhat:windows_machine_config:10.19::el9"
],
"versions": [
{
"version": "1789075615",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift for Windows Containers 10.20",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "openshift4-wincw/windows-machine-config-rhel9-operator",
"cpes": [
"cpe:/a:redhat:windows_machine_config:10.20::el9"
],
"versions": [
{
"version": "1789075603",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift for Windows Containers 10.21",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "openshift4-wincw/windows-machine-config-rhel9-operator",
"cpes": [
"cpe:/a:redhat:windows_machine_config:10.21::el9"
],
"versions": [
{
"version": "1787065708",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift for Windows Containers 10.22",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "openshift4-wincw/windows-machine-config-rhel9-operator",
"cpes": [
"cpe:/a:redhat:windows_machine_config:10.22::el9"
],
"versions": [
{
"version": "1783692800",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift for Windows Containers 11.0",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "openshift4-wincw/windows-machine-config-rhel9-operator",
"cpes": [
"cpe:/a:redhat:windows_machine_config:11.0::el9"
],
"versions": [
{
"version": "1793279001",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift Container Platform 4",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "openshift4-wincw/windows-machine-config-rhel8-operator",
"cpes": [
"cpe:/a:redhat:openshift:4"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift Container Platform 4",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "openshift4-wincw/windows-machine-config-rhel9-operator",
"cpes": [
"cpe:/a:redhat:openshift:4"
]
}
]
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"affectedData": [
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift for Windows Containers 10.21",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "openshift4-wincw/windows-machine-config-rhel9-operator",
"cpes": [
"cpe:/a:redhat:windows_machine_config:10.21::el9"
],
"versions": [
{
"version": "1787065708",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift for Windows Containers 10.22",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "openshift4-wincw/windows-machine-config-rhel9-operator",
"cpes": [
"cpe:/a:redhat:windows_machine_config:10.22::el9"
],
"versions": [
{
"version": "1783692800",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift Container Platform 4",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "openshift4-wincw/windows-machine-config-rhel8-operator",
"cpes": [
"cpe:/a:redhat:openshift:4"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift Container Platform 4",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "openshift4-wincw/windows-machine-config-rhel9-operator",
"cpes": [
"cpe:/a:redhat:openshift:4"
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "CHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 2.0,
"impactScore": 6.0
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "CHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 2.0,
"impactScore": 6.0
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-06-22T00:00:00+00:00",
"id": "CVE-2026-54099",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-269"
}
]
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-269"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.0",
"versionEndExcluding": "4.22.1",
"matchCriteriaId": "4A5FB226-0EC9-4963-9062-26C254D92F40"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:a:redhat:windows_machine_config_operator:-:*:*:*:*:*:*:*",
"matchCriteriaId": "2219154D-E4AD-4A8E-942A-C4804C00591C"
}
]
}
]
}
],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:47173",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:61780",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:81397",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:82440",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:94562",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-54099",
"source": "[email protected]",
"tags": [
"Vendor Advisory"
]
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487950",
"source": "[email protected]",
"tags": [
"Issue Tracking",
"Vendor Advisory"
]
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:47173",
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:61780",
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-54099",
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"tags": [
"Vendor Advisory"
]
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487950",
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"tags": [
"Issue Tracking",
"Vendor Advisory"
]
},
{
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54099.json",
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"tags": [
"Vendor Advisory"
]
}
]
}