CVE-2026-83509 Windows Setup Files Cleanup Elevation of Privilege Vulnerability

{
  "id": "b13d2c48c1edb462a8b6ab2ea582bfc2b0244cc4b4e467a21a452cf76b439456",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83509",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-83509 Windows Setup Files Cleanup Elevation of Privilege Vulnerability",
    "summary": "An untrusted search path in Windows Setup Files Cleanup allows an authorized attacker to elevate privileges locally.",
    "evidence": "Untrusted search path in Windows Setup Files Cleanup allows an authorized attacker to elevate privileges locally.",
    "products": [
      {
        "name": {
          "value": "Windows Setup Files Cleanup",
          "evidence": "CVE-2026-83509 Windows Setup Files Cleanup Elevation of Privilege Vulnerability"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-83509",
        "evidence": "CVE-2026-83509 Windows Setup Files Cleanup Elevation of Privilege Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 25461,
  "published_at": "2026-10-13T14:00:00+00:00"
}