Import Export Suite for CSV and XML Datafeed <= 7.19 - Authenticated (Subscriber+) Arbitrary File Upload

The Import Export Suite for CSV and XML Datafeed plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the import_single_post_as_csv() function in all versions up to, and including, 7.19. This makes it possible for authenticated attackers, with Subscriber-level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible. Please note this vulnerability was reintroduced in 7.20, and subsequently patched again in 7.20.1.