CVE-2026-83798 Windows Update Stack Spoofing Vulnerability

{
  "id": "b89a80b0e59afda0bcb6fc73e70b269cb0d15a890f971afd8e5b7f4ea3dc8063",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83798",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-83798 Windows Update Stack Spoofing Vulnerability",
    "summary": "An authorized attacker can perform local spoofing due to improper verification of a cryptographic signature in Windows Update Stack.",
    "evidence": "Improper verification of cryptographic signature in Windows Update Stack allows an authorized attacker to perform spoofing locally.",
    "products": [
      {
        "name": {
          "value": "Windows Update Stack",
          "evidence": "Improper verification of cryptographic signature in Windows Update Stack"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-83798",
        "evidence": "CVE-2026-83798 Windows Update Stack Spoofing Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 24993,
  "published_at": "2026-10-13T14:00:00+00:00"
}