Shipping Zones by Drawing for WooCommerce <= 3.3.0 - Unauthenticated Stored Cross-Site Scripting via 'szbd-picked' Checkout Parameter

The Shipping Zones by Drawing for WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'szbd-picked' checkout parameter in versions up to, and including, 3.3.0 The szbd_checkout_field_update_order_meta() handler stores stripslashes(sanitize_text_field($_POST['szbd-picked'])) in order meta without validating the JSON structure or restricting dangerous characters, and the szbd_show_checkout_field_admin_order_meta() handler later concatenates the decoded lat and lng values directly into a double-quoted href attribute without esc_url() or esc_attr(). This makes it possible for unauthenticated attackers, by submitting an ordinary guest-checkout order with a crafted szbd-picked JSON payload, to inject arbitrary attributes (such as onmouseover) onto the Google Maps link in the WooCommerce admin order view that will execute whenever an administrator accesses an injected order.