Multiple cross-site scripting (XSS) vulnerabilities in index.php in phazizGuestbook 2.0 allow remote attackers to inject arbitrary web script or HTML via the (1) name, (2) email, (3) url fields, and (4) text field (content parameter).
https://exchange.xforce.ibmcloud.com/vulnerabilities/27065
http://www.vupen.com/english/advisories/2006/2421
http://www.securityfocus.com/bid/18495
http://www.securityfocus.com/archive/1/436602/100/0/threaded