CVE-2026-83674 Active Directory Federation Services (AD FS) Spoofing Vulnerability

{
  "id": "dd1545e8da86c4d0c5199370ce3e7eba52d9484141c0d0f9e727d9fc285a018d",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83674",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-83674 Active Directory Federation Services (AD FS) Spoofing Vulnerability",
    "summary": "Weak authentication in AD FS allows an unauthorized attacker to perform spoofing over a network.",
    "evidence": "Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.",
    "products": [
      {
        "name": {
          "value": "Active Directory Federation Services (AD FS)",
          "evidence": "CVE-2026-83674 Active Directory Federation Services (AD FS) Spoofing Vulnerability"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-83674",
        "evidence": "CVE-2026-83674 Active Directory Federation Services (AD FS) Spoofing Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 25231,
  "published_at": "2026-10-13T14:00:00+00:00"
}