WooCommerce Multilingual & Multicurrency <= 5.3.6 - Missing Authorization

The WooCommerce Multilingual & Multicurrency plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on a few functions like save_shipping_zone_method_from_ajax, switch_product_variations_language, and update_woocommerce_shipping_settings_for_class_costs_from_ajax in versions up to, and including, 5.3.6. This makes it possible for authenticated attackers, with subscriber-level access and above, to modify plugin settings.