    public static function backend($vars="") {

        if(!empty($_GET['page'])) {
            self::incBack($_GET['page']);
        }else{
            self::incBack('default');
        }
    }

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.