Multiple PHP remote file inclusion vulnerabilities in Vtiger CRM 4.2 and earlier allow remote attackers to execute arbitrary PHP code via a URL in the calpath parameter to (1) modules/Calendar/admin/update.php, (2) modules/Calendar/admin/scheme.php, or (3) modules/Calendar/calendar.php.
https://www.exploit-db.com/exploits/2508
https://exchange.xforce.ibmcloud.com/vulnerabilities/29416
http://www.securityfocus.com/archive/1/448092/100/0/threaded