The Responsive Plus WordPress plugin before 3.4.3 is vulnerable to arbitrary shortcode execution due to the software allowing unauthenticated users to execute the update_responsive_woo_free_shipping_left_shortcode AJAX action that does not properly validate the content_rech_data parameter before processing it as a shortcode.
https://wpscan.com/vulnerability/80ce0f88-3065-48c4-a491-b70e067ce4d7/