SQL injection vulnerability in calendar.php for vBulletin Forum 2.3.x before 2.3.4 allows remote attackers to steal sensitive information via the eventid parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/14144
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-0036
http://www.vbulletin.com/forum/showthread.php?postid=588825