Xavier PHP Management Panel 3.0 is vulnerable to Reflected POST-based XSS via the username parameter when registering a new user at admin/includes/adminprocess.php. If there is an error when registering the user, the unsanitized username will reflect via the error page. Due to the lack of CSRF protection on the admin/includes/adminprocess.php endpoint, an attacker is able to chain the XSS with CSRF in order to cause remote exploitation.
Xavier PHP Management Panel 2.4 allows SQL injection via the usertoedit parameter to admin/adminuseredit.php or the log_id parameter to admin/editgroup.php.