Multiple PHP remote file inclusion vulnerabilities in WebCalendar 0.9.45 allow remote attackers to execute arbitrary PHP code via a URL in the includedir parameter to (1) login.php, (2) get_reminders.php, or (3) get_events.php.
https://www.exploit-db.com/exploits/3492
https://exchange.xforce.ibmcloud.com/vulnerabilities/33008
http://www.securityfocus.com/archive/1/463288
http://www.securityfocus.com/archive/1/462957/100/0/threaded