For a few weeks, Windows Update has been failing with error 0x80070426 in the Event Log. Despite the warning Your device is missing important security and quality fixes
, no update KB item is listed.
The Windows Update Repair tool finishes with apparent success, but despite repeated attempts, it has not resolved the issue. After running repair, a search for updates produces the dialog above.
The OS is Windows 10 Home version 1803, build 17134.112, and the last updates listed in History are KB4100347: Intel microcode updates
, installed 9/17/2018, and KB4456655: Servicing stack update for Windows 10, version 1803
, installed 9/11/2018. History shows no recent pending or failed update.