Unauthenticated Cross Site Scripting (XSS) in StoreGrowth: Smart Sales Booster for WooCommerce | BOGO, Upsells, Direct Checkout, Quick View, Side Cart <= 2.0.6 versions.
Update the WordPress https://wordpress.org/plugins/storegrowth-sales-booster/ plugin to the latest available version (at least 2.1.1).