CVE-2006-2247
WebCalendar 1.0.1 to 1.0.3 generates different error messages depending on whether or not a username is valid, which allows remote attackers to enumerate valid usernames.
Date published : 2006-05-09
http://www.securityfocus.com/bid/17853
http://www.securityfocus.com/archive/1/433053/100/0/threaded