WooCommerce Catalog Enquiry - Arbitrary File Upload

Description

Email from user:

"A 'fix' for the file upload vulnerability seems to have been introduced in version 3.0.2 with the cryptic description "Fixed some data issues."

However I hope you're aware that the vulnerability still exists and can be exploited by simply changing Content-Type in the HTTP request. You're trusting the client to be honest about Content-Type when you check "type" from $_FILES. The very first comment at http://php.net/manual/en/reserved.variables.files.php warns about this."

Additional notes:

File is uploaded to the '/wp-content/uploads/catalog_enquiry/' directory. Content type of "image/png" works.