WordPress 5.0. 1 was released Wednesday night, less than a week after the much anticipated release of WordPress 5.0. This security release fixes seven security vulnerabilities, a few of which are quite serious.
Sites running versions in the 4.x branch of WordPress core are also impacted by some of the issues. WordPress 4.9.9 was released along with 5.0.1 to address the issues for those users.
What To Do
Sites on WordPress 5.0 should update to version 5.0.1 as soon as possible. Those with automatic updates enabled for WordPress core should have already been updated, but given the nature of the vulnerabilities we recommend you check your sites manually just in case.
Sites running WordPress 4.x versions should update to version 4.9.9 as soon as possible. there are conflicting reports about automatic updates working for this upgrade. If you need to manually upgrade, the 4.9.9 update can be downloaded here.
If you require help with this then please contact me here.
All those who already have their websites maintained by me will already have had their websites updated.