SharePoint Server 2019 September 2020 Public Update Bug Update

Microsoft has released workarounds for the SharePoint Server 2019 September 2020 Public Update bugs. There are actually two different bugs, one for the non-English issues surrounding Modern like the blank Command Bar and Site Contents, and a second around managing site collection and site level search settings.

For the Modern bug, the workaround is to use classic views. For search, using PowerShell to modify settings at the site collection and site level rather than the Site Settings UI.

These workarounds are documented in KB4484505.

SharePoint Server 2019 September 2020 Public Update Bug

For the SharePoint Server 2019 September 2020 language-specific update KB4484504, there is an issue with non-English languages and Modern sites. On modern sites, the Site Contents and Command Bar in Lists/Libraries is not rendering. A case was opened and the bug was confirmed.

My recommendation for non-English farms is to hold off on the September 2020 PUs for SharePoint Server 2019 at this time.

SharePoint September 2020 Update Notes

There are a couple of things I wanted to point out in this months patches for all supported versions of SharePoint.

For SharePoint 2010 and 2013, make note of the Known Issues section of specific security hotfixes (and thus the Cumulative Updates that contain them). Per Microsoft, after patching you may see the below error.

Web Part Error: A Web Part or Web Form Control on this Page cannot be displayed or imported. The type could not be found or it is not registered as safe.

If you do encounter this (in your test environment, right?), follow the instructions on KB4572409 to allow your web parts/pages to render correctly.

SharePoint Server 2016 and SharePoint Server 2019 have fixes for OneDrive issues where it requires both patches from the month to be applied. While you should always apply both patches from a given month (or the closest available previous month), make sure to do it this month.

SharePoint Server 2016:

KB4484506

KB4484512

SharePoint Server 2019:

KB4484505

KB4484504

There are some important security updates to consider with this months patches, namely a couple of remote code vulnerabilities that allow an authenticated attacker to execute code under the context of the IIS Application Pool or farm service (timer) account. Even though it requires authentication, consider the security of your end user accounts that do have access to SharePoint.

SharePoint 2019 September 2020 Updates

The SharePoint 2019 September 2020 Updates have been released.

Product KB Article
SharePoint Server 2019 (sts-x-none) https://support.microsoft.com/help/4484505
SharePoint Server 2019 (wssmui) https://support.microsoft.com/help/4484504
Office Online Server https://support.microsoft.com/help/4484503
Office Updates https://support.microsoft.com/help/4576653

For all SharePoint updates, visit SharePoint Updates.

SharePoint 2016 September 2020 Updates

The SharePoint 2016 September 2020 Updates have been released.

Product KB Article
SharePoint Server 2016 (sts-x-none) https://support.microsoft.com/help/4484506
SharePoint Server 2016 (wssmui) https://support.microsoft.com/help/4484512
Office Online Server https://support.microsoft.com/help/4484503
Office Updates https://support.microsoft.com/help/4576653

For all SharePoint updates, visit SharePoint Updates.