Medium · published December 18, 2025
Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. In applications built with the Auth0-PHP SDK, the audience validation in access tokens is performed improperly. Without proper validation, affected applications may accept ID tokens as Access tokens. Projects are affected if they use Auth0-PHP SDK versions between v8.0.0 and v8.17.0, or applications using the following SDKs that rely on the Auth0-PHP SDK versions between v8.0.0 and v8.17.0: Auth0/symfony versions between 5.0.0 and 5.5.0, Auth0/laravel-auth0 versions between 7.0.0 and 7.19.0, and/or Auth0/wordpress plugin versions between 5.0.0-BETA0 and 5.4.0. Auth0/Auth0-PHP version 8.18.0 contains a patch for the issue.
| Product | Versions | Fixed in |
|---|---|---|
| auth0/auth0-php | ≥ 8.0.0, < 8.18.0 | 8.18.0 |
| auth0/laravel-auth0 | ≥ 7.0.0, < 7.20.0 | 7.20.0 |
| auth0/symfony | ≥ 5.0.0, < 5.6.0 | 5.6.0 |
| auth0/wp-auth0 | ≥ 5.0.0, < 5.5.0 | 5.5.0 |