    private function getResponse($size = 128)
    {
        $response = fgets($this->pop_conn, $size);
        if ($this->do_debug >= 1) {
            echo "Server -> Client: $response";
        }
        return $response;
    }
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.