The WooCommerce Wishlist (High customization, fast setup,Free Elementor Wishlist, most features) plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.8.7 via the download_pdf_file() function due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to extract data from wishlists that they should not have access to.