Multiple cross-site scripting (XSS) vulnerabilities in Tachyon Vanilla Guestbook 1.0 beta allow remote attackers to inject arbitrary web script or HTML via unknown vectors related to "posting new messages."
https://exchange.xforce.ibmcloud.com/vulnerabilities/24411
http://www.securityfocus.com/bid/16464
http://www.securityfocus.com/archive/1/426200/100/0/threaded
http://www.securityfocus.com/archive/1/423957/100/0/threaded