Cross-site scripting (XSS) vulnerability in memberlist.php in Jelsoft vBulletin 2.0 rc 2 through 2.2.4 allows remote attackers to steal authentication credentials by injecting script into $letterbits.
https://exchange.xforce.ibmcloud.com/vulnerabilities/8619
http://www.securityfocus.com/bid/4349
http://online.securityfocus.com/archive/1/264023/2002-11-01/2002-11-07/2