    public static function error ($vars="", $val='') {
        if( isset($vars) && $vars != "" ) {
            include(GX_PATH.'/inc/lib/Control/Error/'.$vars.'.control.php');
        }else{
            include(GX_PATH.'/inc/lib/Control/Error/unknown.control.php');
        }
    }
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.