Secunia Security Advisory – A vulnerability has been reported in Simple PHP Guestbook, which can be exploited by malicious people to conduct cross-site scripting attacks.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/85218/sa38053.txt
Source: https://packetstormsecurity.com/files/85218/Secunia-Security-Advisory-38053.html