Cross-site scripting (XSS) vulnerability in index.php in Hiox Guestbook 3.1 allows remote attackers to inject arbitrary web script or HTML via the input forms for signing the guestbook.
https://exchange.xforce.ibmcloud.com/vulnerabilities/26620
http://www.vupen.com/english/advisories/2006/1929
http://www.securityfocus.com/archive/1/434686/100/0/threaded