{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-84003", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-09-01T01:16:35.985Z", "datePublished": "2026-09-08T17:19:32.079Z", "dateUpdated": "2026-09-08T18:39:42.814Z"}, "containers": {"cna": {"title": "Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability", "datePublic": "2026-09-08T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:microsoft_authentication_library_for_node.js:*:*:*:*:*:*:*:*", "versionStartIncluding": "1.0.0", "versionEndExcluding": "5.6.0"}]}]}], "affected": [{"vendor": "Microsoft", "product": "Microsoft Authentication Library", "versions": [{"version": "1.0.0", "lessThan": "5.6.0", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-294: Authentication Bypass by Capture-replay", "lang": "en-US", "type": "CWE", "cweId": "CWE-294"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-09-08T18:39:42.814Z"}, "references": [{"name": "Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84003"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "HIGH", "baseScore": 7.4, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C"}}]}}}

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{"affected": [{"affectedData": [{"product": "Microsoft Authentication Library", "vendor": "Microsoft", "versions": [{"lessThan": "5.6.0", "status": "affected", "version": "1.0.0", "versionType": "custom"}]}], "source": "secure@microsoft.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Authentication bypass by capture-replay in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to perform spoofing over a network."}], "id": "CVE-2026-84003", "lastModified": "2026-09-08T18:39:13.460", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "secure@microsoft.com", "type": "Primary"}]}, "published": "2026-09-08T18:21:11.363", "references": [{"source": "secure@microsoft.com", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84003"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-294"}], "source": "secure@microsoft.com", "type": "Primary"}]}

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