    public static function page($vars) {
        switch (SMART_URL) {
            case true:
                # code...
                $url = Options::get('siteurl')."/".self::slug($vars).GX_URL_PREFIX;
                break;
            
            default:
                # code...
                $url = Options::get('siteurl')."/index.php?page={$vars}";
                break;

        }

        return $url;
    }
The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.