Input validation vulnerability in Product page shipping calculator for WooCommerce 1.3.25

The Product page shipping calculator for WooCommerce plugin for WordPress is vulnerable to a security issue called Stored Cross-Site Scripting. This issue affects certain versions of the plugin up to and including 1.3.25. It makes it possible for attackers who have administrator-level access or higher to inject malicious web scripts into pages. When a user visits the page where the script was injected, the script will be executed. This security issue is limited to multi-site installations and installations where a security feature called “unfiltered_html” has been disabled.