Cross-site scripting (XSS) vulnerability in gbook.php in Filebased guestbook 1.1.3 allows remote attackers to inject arbitrary web script or HTML via the comment section.
https://exchange.xforce.ibmcloud.com/vulnerabilities/11540
http://www.securitytracker.com/id?1006289
http://www.securityfocus.com/bid/7104
http://secunia.com/advisories/8317
http://archives.neohapsis.com/archives/bugtraq/2003-03/0219.html