The Swift Performance Lite plugin for WordPress is vulnerable to unauthorized access due to a missing capability check on the ajax_handler() function in all versions up to, and including, 2.3.6.18. This makes it possible for authenticated attackers, with subscriber-level access and above, to retrieve and modify settings.
https://plugins.trac.wordpress.org/browser/swift-performance-lite/trunk/includes/setup/setup.php#L97