The The CURCY – Multi Currency for WooCommerce – The best free currency exchange plugin – Run smoothly on WooCommerce 9.x plugin for WordPress is vulnerable to arbitrary shortcode execution via the get_products_price() function in all versions up to, and including, 2.2.5. This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes.
https://wordpress.org/plugins/woo-multi-currency/#developers
https://plugins.trac.wordpress.org/changeset/3234505/
https://plugins.trac.wordpress.org/browser/woo-multi-currency/trunk/frontend/cache.php#L60