Ultimate Addons for Contact Form 7 < 3.5.13 - Authenticated (Administrator+) Arbitrary File Upload via 'save_options'

Description

The Ultra Addons for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'save_options' function in all versions up to, and including, 3.5.12. This makes it possible for authenticated attackers, with Administrator-level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible.