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CVE-2026-39976 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.1 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/laravel/passport/issues/1900	[email protected]	ExploitIssue Tracking
https://github.com/laravel/passport/pull/1901	[email protected]	Issue TrackingPatch
https://github.com/laravel/passport/pull/1902	[email protected]	Issue TrackingPatch
https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6	[email protected]	MitigationVendor Advisory
https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996	[email protected]	Issue TrackingPatch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-287	Improper Authentication	[email protected]

Affected Products

Product	Versions
laravel passport	>= 13.0.0, < 13.7.1
CPE cpe:2.3:a:laravel:passport::::::laravel::* Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Jun 2, 2026	Initial Analysis	[email protected]
Apr 9, 2026	New CVE Received	[email protected]