I am in need of a user account bridge between XenForo and Craft (a PHP-based CMS that uses the Yii framework and has native support for plugins, as well as - with the Users package, which I own - profile fields, groups, permissions, and so on).
- User accounts, groups, permissions, etc. are synchronised between the XenForo and Craft databases.
- Craft acts as the "controller" (registrations, validation emails, authentication, profile fields, permissions, etc. are handled through Craft).