Cross-site scripting (XSS) vulnerability in pbguestbook.php in JAB Guest Book allows remote attackers to inject arbitrary web script or HTML via the author parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/30718
http://www.securityfocus.com/bid/21429
http://www.securityfocus.com/archive/1/453482/100/0/threaded