Multiple cross-site scripting (XSS) vulnerabilities in addguest.cgi in Big Webmaster Guestbook Script 1.02 and earlier allow remote attackers to inject arbitrary web script or HTML via the (1) mail, (2) site, (3) city, (4) state, (5) country, and possibly (6) name fields, which are viewed via viewguest.cgi.
https://exchange.xforce.ibmcloud.com/vulnerabilities/26246
http://www.securityfocus.com/bid/17834
http://www.securityfocus.com/archive/1/432970/100/0/threaded
http://securityreason.com/securityalert/843
http://secunia.com/advisories/19971
http://lists.grok.org.uk/pipermail/full-disclosure/2006-May/045752.html