Today Magento announced several critical security updates for Magento 2. The SUPEE-10266 patch fixes 40 security vulnerabilities in Magento 2 as well as an update to the USPS API to support service changes enacted by USPS on September 1, 2017.
Given the nature of this patch Modern Retail is moving as fast as we can to install this patch on your Magento 2 website. We have create a Support Request for your store and will keep you up to date using that ticket. If you have any questions please let us know in the request.
Below you will find the complete announcement from Magento regarding this patch. Thank you.