Incomplete blacklist vulnerability in the FileUploadsFilter class in protected/components/filters/FileUploadsFilter.php in X2Engine X2CRM before 5.0.9 allows remote authenticated users to execute arbitrary PHP code by uploading a file with a .pht extension.
https://www.exploit-db.com/exploits/38323/
http://www.securityfocus.com/archive/1/536546/100/0/threaded
http://seclists.org/fulldisclosure/2015/Sep/92
http://packetstormsecurity.com/files/133717/X2Engine-4.2-Arbitrary-File-Upload.html