Unrestricted file upload vulnerability in index.php in phpGreetCards 3.7 allows remote attackers to execute arbitrary PHP code by uploading a file with an executable extension, then accessing it via a via a link that is listed by userfiles/number_shell.php.
Improper Control of Generation of Code 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.