CVE-2026-26154
Full vulnerability record from the local CVENow database.
Description
Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
Published
2026-04-14 18:16:46.950000
Last modified
2026-10-26 22:10:00.163000
View original CVE JSON
{
"id": "CVE-2026-26154",
"sourceIdentifier": "[email protected]",
"published": "2026-04-14T18:16:46.950",
"lastModified": "2026-10-26T22:10:00.163",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network."
},
{
"lang": "es",
"value": "La validación de entrada indebida en el Servicio de Actualización de Windows Servidor permite a un atacante no autorizado realizar manipulación a través de una red."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Microsoft",
"product": "Windows Server 2012",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "6.2.9200.0",
"lessThan": "6.2.9200.26026",
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"status": "affected"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows Server 2012 (Server Core installation)",
"platforms": [
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],
"versions": [
{
"version": "6.2.9200.0",
"lessThan": "6.2.9200.26026",
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"status": "affected"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows Server 2012 R2",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "6.3.9600.0",
"lessThan": "6.3.9600.23132",
"versionType": "custom",
"status": "affected"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows Server 2012 R2 (Server Core installation)",
"platforms": [
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],
"versions": [
{
"version": "6.3.9600.0",
"lessThan": "6.3.9600.23132",
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"status": "affected"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows Server 2016",
"platforms": [
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],
"versions": [
{
"version": "10.0.14393.0",
"lessThan": "10.0.14393.9060",
"versionType": "custom",
"status": "affected"
}
]
},
{
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"product": "Windows Server 2016 (Server Core installation)",
"platforms": [
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],
"versions": [
{
"version": "10.0.14393.0",
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"status": "affected"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows Server 2019",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.17763.0",
"lessThan": "10.0.17763.8644",
"versionType": "custom",
"status": "affected"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows Server 2019 (Server Core installation)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.17763.0",
"lessThan": "10.0.17763.8644",
"versionType": "custom",
"status": "affected"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows Server 2022",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.20348.0",
"lessThan": "10.0.20348.5020",
"versionType": "custom",
"status": "affected"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows Server 2022, 23H2 Edition (Server Core installation)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.25398.0",
"lessThan": "10.0.25398.2274",
"versionType": "custom",
"status": "affected"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows Server 2025",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.26100.0",
"lessThan": "10.0.26100.32690",
"versionType": "custom",
"status": "affected"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows Server 2025 (Server Core installation)",
"platforms": [
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],
"versions": [
{
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"versionType": "custom",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-04-14T17:59:13.916318Z",
"id": "CVE-2026-26154",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-20"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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"matchCriteriaId": "A7DF96F8-BA6A-4780-9CA3-F719B3F81074"
},
{
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"matchCriteriaId": "DB18C4CE-5917-401E-ACF7-2747084FD36E"
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{
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"versionEndExcluding": "10.0.14393.9060",
"matchCriteriaId": "982DB0CA-5196-4E42-B2F7-994BE8179715"
},
{
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]
}
],
"references": [
{
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26154",
"source": "[email protected]",
"tags": [
"Vendor Advisory"
]
}
]
}