Cross-site scripting (XSS) vulnerability in calendar.php in Jelsoft vBulletin before 3.6.6 allows remote attackers to inject arbitrary web script or HTML via the title field in a single add action.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34333
http://www.securityfocus.com/bid/24020
http://www.securityfocus.com/archive/1/468731/100/0/threaded
http://securityreason.com/securityalert/2751