Cross-site scripting (XSS) vulnerability in addentry.php in Chipmunk Guestbook 1.4 and earlier allows remote attackers to inject arbitrary web script or HTML via the homepage parameter.
http://www.securityfocus.com/bid/19087
http://www.securityfocus.com/bid/16112
http://www.securityfocus.com/archive/1/420667/100/0/threaded