Laravel Passport vulnerabilities

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Published CVEs affecting Laravel Passport: 1 record(s), with affected versions and fixes.
cpe:2.3:a:laravel:passport

CVE-2026-39976 High · 7.1 CWE-287 Apr 9, 2026

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 vulnerability is fixed in 13.7.1.