WooCommerce was updated to version 2.3.12, from version 2.3.11. Changelog:

• Fix – Fixed Google Chrome forcing to use SSL. This can cause some issues on websites behind load balancers or reverse proxies.
• Fix – Escaped shop url in empty cart template.
• Fix – Escaped product tabs titles.
• Fix – Removed deprecated PHP4 constructor on Widget classes.
• Fix – Wrong price_slider_updated JS event arguments.
• Fix – Stock quantity type in WC-API.
• Fix – Don’t reveal username when login failed on valid email login.
• Fix – Fatal error on order details when have some downloadable product deleted.
• Fix – Relative paths validation for downloadable product.
• Fix – Flat rate shipping costs should ignore virtual items.
• Tweak – Keep product quantity when happens some error while add product on the cart.