CVE-2026-78457 Windows Security Health Service Elevation of Privilege Vulnerability

{
  "id": "d9ddcd261327b0b977d04bbfae28c58bbf23bbf0c9e017c607e9797d746153a6",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78457",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-78457 Windows Security Health Service Elevation of Privilege Vulnerability",
    "summary": "An authorized attacker can exploit a use-after-free in Windows Security Health Service to elevate privileges locally.",
    "evidence": "Use after free in Windows Security Health Service allows an authorized attacker to elevate privileges locally.",
    "products": [
      {
        "name": {
          "value": "Windows Security Health Service",
          "evidence": "Use after free in Windows Security Health Service allows an authorized attacker to elevate privileges locally."
        },
        "prerequisites": [
          {
            "value": "an authorized attacker",
            "evidence": "Use after free in Windows Security Health Service allows an authorized attacker to elevate privileges locally."
          }
        ],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-78457",
        "evidence": "CVE-2026-78457 Windows Security Health Service Elevation of Privilege Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 27134,
  "published_at": "2026-09-08T14:00:00+00:00"
}