{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-39976", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-08T00:01:47.628Z", "datePublished": "2026-04-09T16:50:42.326Z", "dateUpdated": "2026-04-09T19:31:53.801Z"}, "containers": {"cna": {"title": "Laravel Passport's TokenGuard Authenticates Unrelated User for Client Credentials Tokens", "problemTypes": [{"descriptions": [{"cweId": "CWE-287", "lang": "en", "description": "CWE-287: Improper Authentication", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6"}, {"name": "https://github.com/laravel/passport/issues/1900", "tags": ["x_refsource_MISC"], "url": "https://github.com/laravel/passport/issues/1900"}, {"name": "https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996", "tags": ["x_refsource_MISC"], "url": "https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996"}, {"name": "https://github.com/laravel/passport/pull/1901", "tags": ["x_refsource_MISC"], "url": "https://github.com/laravel/passport/pull/1901"}, {"name": "https://github.com/laravel/passport/pull/1902", "tags": ["x_refsource_MISC"], "url": "https://github.com/laravel/passport/pull/1902"}], "affected": [{"vendor": "laravel", "product": "passport", "versions": [{"version": ">= 13.0.0, < 13.7.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-09T16:50:42.326Z"}, "descriptions": [{"lang": "en", "value": "Laravel Passport provides OAuth2 server support to Laravel. From 13.0.0 to before 13.7.1, there is an Authentication Bypass for client_credentials tokens. the league/oauth2-server library sets the JWT sub claim to the client identifier (since there's no user). The token guard then passes this value to retrieveById() without validating it's actually a user identifier, potentially resolving an unrelated real user. Any machine-to-machine token can inadvertently authenticate as an actual user. This vulnerability is fixed in 13.7.1."}], "source": {"advisory": "GHSA-349c-2h2f-mxf6", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-09T17:38:00.854614Z", "id": "CVE-2026-39976", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-09T19:31:53.801Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Laravel Passport provides OAuth2 server support to Laravel. From 13.0.0 to before 13.7.1, there is an Authentication Bypass for client_credentials tokens. the league/oauth2-server library sets the JWT sub claim to the client identifier (since there's no user). The token guard then passes this value to retrieveById() without validating it's actually a user identifier, potentially resolving an unrelated real user. Any machine-to-machine token can inadvertently authenticate as an actual user. This vulnerability is fixed in 13.7.1."}], "id": "CVE-2026-39976", "lastModified": "2026-04-09T17:16:31.267", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 4.7, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-04-09T17:16:31.267", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/laravel/passport/issues/1900"}, {"source": "security-advisories@github.com", "url": "https://github.com/laravel/passport/pull/1901"}, {"source": "security-advisories@github.com", "url": "https://github.com/laravel/passport/pull/1902"}, {"source": "security-advisories@github.com", "url": "https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6"}, {"source": "security-advisories@github.com", "url": "https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}], "source": "security-advisories@github.com", "type": "Primary"}]}

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