GHSA-349c-2h2f-mxf6
High · 7.1Laravel Passport: TokenGuard Authenticates Unrelated User for Client Credentials Tokens
CVSS
7.1
EPSS
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Published
Apr 8, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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