WordPress today has issued a maintenance release to WordPress core, which fixes a few bugs. You can read more about this in WordPress’ official release post. We will be updating all customers that are currently on the 5.0 branch to the latest version of that branch. Your installs will be updated to their latest secure version of their specific branch. 4.9.9 for instance, will be untouched due to not being in the 5.0 branch. Please take a look at our WordPress Upgrade article here for more information on our upgrade process.
Because you are a WP Engine customer, you do not have to take action at this time. Our team is working to issue patches across the WP Engine platform to upgrade affected installs to their next stable version. We’ve got your back. As always, thank you for trusting WP Engine to host your WordPress sites. Automated maintenance updates like these are part of our promise to deliver a secure WordPress experience while ensuring the security of our customers.