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High

Security advisory

Type: advisorySources: OSVCVE: CVE-2026-84003

Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-84003
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 06:11 UTC · Revision 1

Source evidence

CVE-2026-84003

core-osv · Original source

Published 8 Sept 2026, 18:21 UTC

Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.

osv:CVE-2026-84003
Complete source record
{
  "id": "a9203285b8ea987c3ea49b76f3318596e93656174c249b07a44aef35721f0661",
  "url": "https://osv.dev/vulnerability/CVE-2026-84003",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-84003",
    "summary": "Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.",
    "evidence": "osv:CVE-2026-84003",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-84003",
      "aliases": [
        "CVE-2026-84003"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/azuread/microsoft-authentication-library-for-js",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4f0241d6e3fcafeb3aac0a041b867aeae71fe749"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:microsoft:azure\\/msal-node:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.6.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84003.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:36.616828141Z",
      "provider": "osv",
      "references": [
        "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84003"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2026-84003",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 434023,
  "published_at": "2026-09-08T18:21:11.363+00:00"
}