The Spexo theme for WordPress is vulnerable to unauthorized access due to a missing capability check on the activate_plugin function in all versions up to, and including, 2.0.11. This makes it possible for authenticated attackers, with Subscriber-level access and above, to activate a limited set of plugins.
https://themes.trac.wordpress.org/browser/spexo/2.0.6/inc/activation/class-welcome-notice.php
https://themes.trac.wordpress.org/browser/spexo/2.0.11/inc/activation/class-welcome-notice.php#L304