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You may lose system certificates after Patch Tuesday updates


Unlike regular updates that rarely demand much attention, Patch Tuesday updates involve a much bigger process.

In spite of that, certain issues do arise. System and user certificates might be lost when users update their PC from Windows 10, version 1809 or later to a later version of Windows 10.


October Patch Tuesday may cause system certificate issues

Microsoft has recently distributed a new cumulative update KB4586781 to its users via Windows Update and WSUS.

This non-security patch increases the build numbers of version 2004 to 19041.630 and version 20H2 to 19042.630.

According to the official Microsoft changelog regarding the KB4586781 cumulative updates, it seems that they may lead to problems related to system and user certificates:

Devices will only be impacted if they have already installed any Latest cumulative update (LCU) released September 16, 2020 or later and then proceed to update to a later version of Windows 10 from media or an installation source which does not have an LCU released October 13, 2020 or later integrated.

This primarily happens when managed devices are updated using outdated bundles or media through an update management tool such as Windows Server Update Services (WSUS) or Microsoft Endpoint Configuration Manager.

Things are no different for KB4586786 cumulative updates (OS builds 18362.1198 and 18363.1198). If you are also bothered by this issue, feel free to mitigate it within the uninstall window by going back to your previous version of Windows.


That covers our topic for today. If you need a summary of the November Patch Tuesday, we have written this dedicated article that includes the download links that you can use to get the updates right away.

The next Patch Tuesday falls on December 8, so rest assured that we’ll return with new details. Until then, enjoy your patching and make sure to keep your PC safe from the latest threats.



This post was written by Vlad Turiceanu and was first posted to WindowsReport



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