Unrestricted file upload vulnerability in process-upload.php in ProjectSend (formerly cFTP) r100 through r561 allows remote attackers to execute arbitrary PHP code by uploading a file with a PHP extension, then accessing it via a direct request to the file in the upload/files/ or upload/temp/ directory.
The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.