WordPress has released a new maintenance/security update this week for WordPress core: version 4.9.5. Version 4.9.5 comes with minor security and maintenance fixes which the WordPress core team deemed impactful enough to warrant a release.
For details on this release you may reference the official blog post on WordPress.org: https://wordpress.org/news/2018/04/wordpress-4-9-5-security-and-maintenance-release/
As with all maintenance/security related updates, WordPress has released patches for older functional versions as well. As a wisnet customer, no action is required on your part. Our team is already working to push out automatic updates to your site(s) to ensure they are in the next version. Our team always strives provide the most secure WordPress experience for all our customers.