CVE-2026-71338 Windows Failover Cluster Elevation of Privilege Vulnerability

{
  "id": "b9327fa3a9781fb49c454df5207f992128b57b082c745d519a5490650a4d36e9",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71338",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-71338 Windows Failover Cluster Elevation of Privilege Vulnerability",
    "summary": "A double-free vulnerability in Windows Failover Cluster may allow an authorized attacker to elevate privileges locally.",
    "evidence": "Double free in Windows Failover Cluster allows an authorized attacker to elevate privileges locally.",
    "products": [
      {
        "name": {
          "value": "Windows Failover Cluster",
          "evidence": "Double free in Windows Failover Cluster allows an authorized attacker to elevate privileges locally."
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-71338",
        "evidence": "CVE-2026-71338 Windows Failover Cluster Elevation of Privilege Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 26594,
  "published_at": "2026-09-08T14:00:00+00:00"
}