Product GTIN (EAN, UPC, ISBN) for WooCommerce <= 1.1.1 - Contributor+ Stored XSS

The Product GTIN (EAN, UPC, ISBN) for WooCommerce WordPress plugin through 1.1.1 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.