An arbitrary file upload vulnerability in /classes/profile.class.php in Jigowatt "PHP Login & User Management" before 4.1.1, as distributed in the Envato Market, allows any remote authenticated user to upload .php files to the web server via a profile avatar field. This results in arbitrary code execution by requesting the .php file.
https://doddsecurity.com/94/remote-code-execution-in-the-avatars/
https://codecanyon.net/item/php-login-user-management/49008
http://www.securityfocus.com/archive/1/542038/100/0/threaded
http://packetstormsecurity.com/files/147878/PHP-Login-And-User-Management-4.1.0-Shell-Upload.html