setcookie.php for the administration login in Professional Home Page Tools Guestbook records the hash of the administrator password in a cookie, which allows attackers to conduct brute force password guessing attacks after obtaining the hash.
https://exchange.xforce.ibmcloud.com/vulnerabilities/27775
http://www.securityfocus.com/archive/1/440421/100/0/threaded
http://securitytracker.com/id?1016550