We can only give our fair guess, but it seems that it is predestined for the upcoming major Windows 10 updates, especially the release 1803. Once checked, you can find out that this is some kind of test update, probably wrongfully deployed through Windows Server Update Service. Apparently, KB4078126 makes improvements to ease the upgrade experience to Windows 10. However, Microsoft strongly advises users not to install it. Reddit users are as  confused about this update as we are: We’ll update this article as soon as new information is available. RELATED STORIES YOU SHOULD CHECK OUT:

Windows 10 KB4077735 includes a logging issue Microsoft acknowledges KB3177725 and KB3176493 print bugs Windows 10 KB4056254 improves the update install process

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