    protected function escape($string) {
        $string = HTMLPurifier_Encoder::cleanUTF8($string);
        $string = htmlspecialchars($string, ENT_COMPAT, 'UTF-8');
        return $string;
    }
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.