The Dynamic Pricing With Discount Rules for WooCommerce WordPress plugin before 5.0.0 does not validate a nonce or user capabilities on one of its AJAX actions and reflects unsanitised user input in the response, allowing unauthenticated attackers to perform Reflected Cross-Site Scripting against a victim who is induced to send a crafted request.
https://wpscan.com/vulnerability/5e3786de-4b4d-4da2-b129-7b0fef90a386/