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Laravel Passport's TokenGuard Authenticates Unrelated User for Client Credentials Tokens

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

CWE-287Apr 9, 2026
CVSS7.1v3.1EPSS0.289%PoCs0SignalsNot listed in CISA KEVNo known ransomware useNo Nuclei templatesSTIX