    public function disconnect()
    {
        $this->sendString('QUIT');
        //The QUIT command may cause the daemon to exit, which will kill our connection
        //So ignore errors here
        try {
            @fclose($this->pop_conn);
        } catch (Exception $e) {
            //Do nothing
        };
    }
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.