Cross-site scripting (XSS) vulnerability in index.php in iPei Guestbook 2.0 allows remote attackers to inject arbitrary web script or HTML via the pg parameter, a different vector than CVE-2005-4597.
https://exchange.xforce.ibmcloud.com/vulnerabilities/46111
http://www.vupen.com/english/advisories/2008/2920
http://www.securityfocus.com/archive/1/497783/100/0/threaded