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

The plugin 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.

[wpm_product_gtin id='1' wrapper='div onmouseover="alert(1)" style="background:red;width:100px;height:100px;"']

Notes:
- A Product with a EAN Code meta needs to be in the Inventory tab.
- The id in the shortcode is the product id.