Unlimited Elements For Elementor <= 2.0.16 - Reflected Cross-Site Scripting

The Unlimited Elements For Elementor plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via 'data[name]' Parameter in all versions up to, and including, 2.0.16 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. The show_preview AJAX action is registered for unauthenticated users and is gated only by a nonce, which an unauthenticated attacker can retrieve by loading any publicly accessible page that emits it.