WordPress 5.0.1 is a security release available now and should be applied immediately.
This update addresses a security issue that affects all WordPress versions since 3.7 and fixes a number of vulnerabilities.
You can read more by looking at the release notes: https://codex.wordpress.org/Version_5.0.1
If you have not done so already – download the update or simply use your existing installation of WordPress to update your site. Either way – this is an excellent time to make a backup copy of your site(s) before upgrading.