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HistoryNov 09, 2021 - 8:00 a.m.

Description of the security update for Office Online Server: November 9, 2021 (KB5002053)


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Description of the security update for Office Online Server: November 9, 2021 (KB5002053)


This security update resolves a Microsoft Excel remote code execution vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2021-40442.


  • To apply this security update, you must have the release version of Microsoft Office Online Server installed on the computer.
  • Support for Windows Server 2022 has been added for Office Online Server.

How to get and install the update

Method 1: Microsoft Update

This update is available from Microsoft Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.

Method 2: Microsoft Update Catalog

To get the standalone package for this update, go to the Microsoft Update Catalog website.

Method 3: Microsoft Download Center

You can get the standalone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.

More information

Security update deployment information

For deployment information about this update, see Security update deployment information: November 9, 2021 (KB5007403).

Security update replacement information

This security update replaces previously released security update 5002027.

File hash information

File name SHA256 hash
wacserver2019-kb5002053-fullfile-x64-glb.exe 411204D84592C974A62CEF3D6D4887CE96712443D8CDE41830ED389B506E4357

File information

Download the list of files that are included in security update 5002053.

Information about protection and security

Protect yourself online: Windows Security supportLearn how we guard against cyber threats: Microsoft Security