    public static function incFront($vars, $param='') {
        $file = GX_PATH.'/inc/lib/Control/Frontend/'.$vars.'.control.php';
        if ( file_exists($file) ) {
            # code...
            include($file);
        }else{
            self::error('404');
        }

    }

The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.