Description of the security update for Office Online Server: October 13, 2020

Applies to: Office Online Server


This security update resolves vulnerabilities in Microsoft Office that could allow remote code execution if a user opens a specially crafted Office file. To learn more about these vulnerabilities, see see the following security advisories:

Note To apply this security update, you must have the release version of Microsoft Office Online Server installed on the computer.

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: October 13, 2020.

Security update replacement information

This security update replaces previously released security update 4484503.

File hash information

File name SHA1 hash SHA256 hash
wacserver2019-kb4486674-fullfile-x64-glb.exe 1D30E5EB4B9A9B4654E3F4E6137D7B83F68F7D4A B39F6D186279D74B6A3CF8018E61341BC74FEE0D86F85B7E282B4A1156B0738D

File information

Download the list of files that are included in security update 4486674.

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security