The WooCommerce 2.3.11 release is now available via WordPress.org or automatic update in your administration panel.
A total of 32 commits made it into this release.
This release includes several bug fixes which you can read about in the changelog, and a security fix discovered by the Sucuri team. This issue was within the PayPal payment gateway. Full details can be found on the Sucuri blog here.
(As always, the comments on this post are closed because this is not the right platform for support requests.)