CVE-2026-39976

7.1 HIGH

Laravel Passport provides OAuth2 server support to Laravel

Published: 2026-04-09 · Last updated: 2026-06-02

Severity and scoring

CVSS: 7.1 HIGH
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
CWE: CWE-287

Affected products

Vendor	Product
laravel	passport

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-39976
[Exploit reference]https://github.com/laravel/passport/issues/1900
[Patch]https://github.com/laravel/passport/pull/1901
[Patch]https://github.com/laravel/passport/pull/1902
[Vendor advisory]https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6
[Patch]https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996

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