SQL injection vulnerability in vBulletin 5.0.4 through 5.1.3 Alpha 5 allows remote attackers to execute arbitrary SQL commands via the criteria[startswith] parameter to ajax/render/memberlist_items.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-5000
http://www.securityfocus.com/bid/68709
http://packetstormsecurity.com/files/127537/vBulletin-5.1.2-SQL-Injection.html