source: http://www.securityfocus.com/bid/14442/info

PHPFreeNews is prone to an SQL injection vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input before using it in an SQL query.

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. 

An example has been provided:

login: Admin
password: ') or isnull(1/0) or ('a'='a