CVE-2026-39976
Laravel Passport's TokenGuard Authenticates Unrelated User for Client Credentials Tokens
CVSS Score
7.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-287 |
| Vendor | laravel |
| Product | passport |
| Published | Apr 9, 2026 |
| Last Updated | Apr 9, 2026 |
Stay Ahead of the Next One
Get instant alerts for laravel passport
Be the first to know when new high vulnerabilities affecting laravel passport are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
laravel / passport
>= 13.0.0, < 13.7.1
References
github.com: https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6 github.com: https://github.com/laravel/passport/issues/1900 github.com: https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996 github.com: https://github.com/laravel/passport/pull/1901 github.com: https://github.com/laravel/passport/pull/1902