The woocommerce-product-addon plugin before 18.4 for WordPress has XSS via an import of a new meta data structure.
The PPOM for WooCommerce WordPress plugin before 24.0 does not have authorisation and CSRF checks in the ppomsettingspanelaction AJAX action, allowing any authenticated to call it and set arbitrary settings. Furthermore, due to the lack of sanitisation and escaping, it could lead to Stored XSS issues