The ReviewX plugin for WordPress is vulnerable to privilege escalation in versions up to, and including, 1.6.13 due to insufficient restriction on the 'rxsetscreenoptions' function. This makes it possible for authenticated attackers, with minimal permissions such as a subscriber, to modify their user role by supplying the 'wpscreenoptions[option]' and 'wpscreenoptions[value]' parameters during a screen option update.