source: http://www.securityfocus.com/bid/20372/info

ackerTodo is prone to multiple SQL-injection vulnerabilities because the application fails to properly sanitize user-supplied input before using it in SQL queries. 

A successful exploit could allow an attacker to compromise the application, access or modify data, or exploit vulnerabilities in the underlying database implementation.

These issues affect ackerTodo version 4.2; other versions may also be vulnerable.

http://www.example.com/gadget/login.php?up_login=admin&up_pass=wrongpass')%20or%20(%20'1'%20=%20'1'%20AND%20login%20=%20'admin&up_num_tasks=100%20UNION%20select%20*%20FROM%20tasks