April 2021 updates for Office 365, 2019 and 2016 – Windows

Details and warnings about the April 2021 security and non-security updates for Office 365, Office 2019 and Office 2016 for Windows.  There are some side-effects to watch out for.

All these update will, or have been, pushed to your computer already.  We’ve included a tip on how to force an update to the latest release.

Update side-effects

This month’s updates come with warnings about possible side-effects, just like a vaccination!

“ Some Office files, templates, and add-ins can be manipulated to harm your computer. After you install the April 2021 security updates for Office, your computer might display a notification and disable some of these files, even if the files were originally obtained from Microsoft. For more information about this issue and how to re-enable the disabled content, see KB5001196. “

Office 2013 and Office 2010 have other post-update troubles related to additional language packs.  See the Microsoft page for details.

Latest versions at 13 April 2021

Here are the latest versions of Office 365 at 13 April 2021, for the ‘Click to Run’ installations of Office.

Check your version at File | Account | About …

Use Update Options | Update Now on the same pane to force an update to the latest version.

Office 365

Current Channel: Version 2103 (Build 13901.20400)

This is the public non-Insiders release for most people with Microsoft 365 Family (Home Premium) or Personal.

In Organizations there are a few possibilities:

Monthly Enterprise Channel: Version 2102 (Build 13801.20506)
Monthly Enterprise Channel: Version 2101 (Build 13628.20664)
Semi-Annual Enterprise Channel (Preview): Version 2102 (Build 13801.20506)
Semi-Annual Enterprise Channel: Version 2008 (Build 13127.21506)
Semi-Annual Enterprise Channel: Version 2002 (Build 12527.21814)

Some organizations may limit access to the most recent versions, depending on the in-house update policies.

Office 2019

Office 2019 Retail: Version 2103 (Build 13901.20400)
Office 2019 Volume Licensed: Version 1808 (Build 10373.20050)

Microsoft 365 apps

Microsoft 365 Apps on Windows 7: Version 2002 (Build 12527.21814)

Office 2016 (Click to Run)

Office 2016 Retail: Version 2103 (Build 13901.20400)

Security updates

Here are links to the very limited summaries of each security bug fixed by the latest updates.


Remote Code Execution Vulnerability CVE-2021-28449


Remote Code Vulnerability  CVE-2021-28453


Information Disclosure Vulnerability CVE-2021-28456

Remote Code Vulnerability  CVE-2021-28451

Remote Code Vulnerability  CVE-2021-28454


Memory Corruption Vulnerability CVE-2021-28452