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 'rx_set_screen_options' function. This makes it possible for authenticated attackers, with minimal permissions such as a subscriber, to modify their user role by supplying the 'wp_screen_options[option]' and 'wp_screen_options[value]' parameters during a screen option update.
https://plugins.trac.wordpress.org/browser/reviewx/tags/1.6.13/includes/rx-functions.php#L972
https://lana.codes/lanavdb/a889c3ff-5df0-4d7e-951f-0b0406468efa/