The Clever Fox – One Click Website Importer by Nayra Themes plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'clever-fox-activate-theme' function in all versions up to, and including, 25.2.0. This makes it possible for authenticated attackers, with subscriber access and above, to modify the active theme, including to an invalid value which can take down the site.
Vulmon