Multiple SQL injection vulnerabilities in vBulletin before 3.0.9 allow remote attackers to execute arbitrary SQL commands via the (1) request parameter to joinrequests.php, (2) limitnumber or (3) limitstart to user.php, (4) usertitle.php, or (5) usertools.php.
https://exchange.xforce.ibmcloud.com/vulnerabilities/22323
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-3019
http://www.securityfocus.com/bid/14872
http://secunia.com/advisories/16873/