high7.1
CVE-2026-39976
Laravel Passport: TokenGuard Authenticates Unrelated User for Client Credentials Tokens
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | laravel/passport | >= 13.0.0, < 13.7.1 | 13.7.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Laravel | Passport | from 13.0.0 before 13.7.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/laravel/passport/issues/1900
- https://github.com/laravel/passport/pull/1901
- https://github.com/laravel/passport/pull/1902
- https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6
- https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996
- https://github.com/advisories/GHSA-349c-2h2f-mxf6
- https://nvd.nist.gov/vuln/detail/CVE-2026-39976