source: https://www.securityfocus.com/bid/15653/info
  
Softbiz FAQ is prone to multiple SQL injection vulnerabilities because the application fails to properly sanitize user-supplied input before using it in an SQL query.
  
A successful exploit could allow an attacker to compromise the application, access or modify data, or exploit vulnerabilities in the underlying database.
  
Softbiz FAQ 1.1 and prior versions are vulnerable; other versions may also be affected. 

http://www.example.com/refer_friend.php?id=[SQL]