Multiple cross-site scripting vulnerabilities in signed.php in Hinton Design phphg Guestbook 1.2 allow remote attackers to inject arbitrary web script or HTML via the (1) location, (2) website, or (3) message parameter.
http://www.vupen.com/english/advisories/2006/0480
http://www.securityfocus.com/bid/16541
http://www.securityfocus.com/archive/1/424740/100/0/threaded
http://securitytracker.com/id?1015620