Cluster Client Failover (CCF) Elevation of Privilege Vulnerability_CVE-2026-21251

{
    "lastseen": "",
    "description": "",
    "published": "2026-02-10T17:51:40.939Z",
    "modified": "2026-02-10T18:58:26.253Z",
    "type": "cve",
    "title": "Cluster Client Failover (CCF) Elevation of Privilege Vulnerability",
    "source": "microsoft",
    "references": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21251",
    "id": "CVE-2026-21251",
    "bulletinFamily": "",
    "cwe": [
        "CWE-416"
    ],
    "cvelist": null,
    "sourceData": "Microsoft Windows Server 2019 10.0.17763.0\nMicrosoft Windows Server 2019 (Server Core installation) 10.0.17763.0\nMicrosoft Windows Server 2022 10.0.20348.0\nMicrosoft Windows Server 2025 (Server Core installation) 10.0.26100.0\nMicrosoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0\nMicrosoft Windows Server 2025 10.0.26100.0\nMicrosoft Windows Server 2016 10.0.14393.0\nMicrosoft Windows Server 2016 (Server Core installation) 10.0.14393.0",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Windows Server 2019",
    "version": "10.0.17763.0",
    "vendor": "Microsoft",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}