https://wccftech.com/cumulative-updates-windows-10-3/

Microsoft has released more cumulative updates for this month, which are available for some versions of Windows 10, including 1803, 1709, 1703, and 1607. There is nothing available for the latest Windows 10 October 2018 Update (version 1809) as yet.

Windows 10 April 2018 Update (version 1803) gets quite a long list of bug fixes, but also carries a handful of known issues. Here’s everything that has been fixed with Windows 10 1803 Build 17134.677 (KB4489894):