Secunia Security Advisory – Some vulnerabilities have been discovered in realGuestbook, which can be exploited by malicious people to conduct SQL injection or cross-site scripting attacks.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/55280/sa24602.txt
Source: https://packetstormsecurity.com/files/55280/Secunia-Security-Advisory-24602.html