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.
https://wpscan.com/vulnerability/4abd1454-380c-4c23-8474-d7da4b2f3b8e