CVE-2026-84003 Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability

{
  "id": "2ca5c09662cf91850b863ce6193e3fdec9aa4cd2c9ab11659ae90d7268a646b9",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84003",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-84003 Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability",
    "summary": "An unauthorized attacker could exploit a capture-replay authentication bypass in MSAL for Node.js to perform spoofing over a network.",
    "evidence": "Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.",
    "products": [
      {
        "name": {
          "value": "Microsoft Authentication Library (MSAL) for Node.js",
          "evidence": "CVE-2026-84003 Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-84003",
        "evidence": "CVE-2026-84003 Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 27199,
  "published_at": "2026-09-08T14:00:00+00:00"
}