export_handler.php in WebCalendar 1.0.1 allows remote attackers to overwrite WebCalendar data files via a modified id parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/23370
http://www.vupen.com/english/advisories/2005/2643
http://www.ush.it/2005/11/28/webcalendar-multiple-vulnerabilities
http://www.securityfocus.com/bid/15608
http://www.securityfocus.com/archive/1/417900/100/0/threaded
http://www.debian.org/security/2006/dsa-1002
http://sourceforge.net/forum/forum.php?thread_id=1392833&forum_id=11587
http://securityreason.com/securityalert/215