source: https://www.securityfocus.com/bid/14629/info

PHPKit is prone to multiple SQL injection vulnerabilities. These issues are due to a failure in the application to properly sanitize user-supplied input before using it in SQL queries.

Successful exploitation could result in a compromise of the application, disclosure or modification of data, or may permit an attacker to exploit vulnerabilities in the underlying database implementation. 

http://www.example.com/phpkit/include.php?path=login/member.php&letter=phuket'%20AND%20MID(user_pw,1,1)='8'/*