Category Discount Woocommerce <= 4.11 - Cross-Site Request Forgery via wpcd_save_discount()

The Category Discount Woocommerce plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 4.12. This is due to missing or incorrect nonce validation on the wpcd_save_discount() function. This makes it possible for unauthenticated attackers to modify product category discounts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.