https://www.bleepingcomputer.com/news/microsoft/windows-10-update-assistant-vulnerability-needs-manual-fix-heres-how/

Microsoft has released a new version of the Windows 10 Update Assistant in order to fix a local privilege escalation vulnerability. While there is no imminent threat, the only way to fix this vulnerability is to uninstall the program or download the latest version.

The Windows 10 Update Assistant is a Microsoft program that helps you download and upgrade to the latest version of Windows 10.  On older versions of Windows, it may also intermittently show you small alerts that prompt you to install the latest Windows 10 feature update.