source: http://www.securityfocus.com/bid/68557/info

WP Rss Poster plugin for WordPress is prone to an SQL-injection vulnerability because it fails to sufficiently sanitize user-supplied input.

An attacker can exploit this issue to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database.

WP Rss Poster 1.0.0 is vulnerable; other versions may also be affected. 

http://www.example.com/wp-admin/admin.php?page=wrp-add-new&id=2 union select 1,user(),database(),4,5,6,7,8,9,10,11,12,13,14,15,@@version,17,18