HT Slider For Elementor <= 1.3.9 - Cross-Site Request Forgery to Arbitrary Plugin Activation

The HT Slider For Elementor plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.3.9. This is due to missing or incorrect nonce validation on the 'plugin_activation' function. This makes it possible for unauthenticated attackers to activate arbitrary plugins already installed (but deactivated) on the site via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.