Multiple SQL injection vulnerabilities in class.php in Professional Home Page Tools Guestbook allow remote attackers to execute arbitrary SQL commands via the (1) hidemail, (2) name, (3) mail, (4) ip, or (5) text parameters.
https://exchange.xforce.ibmcloud.com/vulnerabilities/27774
http://www.vupen.com/english/advisories/2006/2876
http://www.securityfocus.com/bid/19019
http://www.securityfocus.com/archive/1/440421/100/0/threaded
http://securitytracker.com/id?1016550