Description of the security update for Office Online Server: January 12, 2021

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 the following security advisories:

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

Improvements and fixes

Chrome browser version 72 and later versions block popup dialog boxes that aren't initiated by a user click. This prevents the Insert Picture feature from displaying its popup dialog box. This update fixes the issue. After you apply this update, the Insert Picture command opens a dialog box in which you can select Choose File to browse for a file in a second dialog box. After you select the desired file, you are returned to the Insert Picture dialog box, where you can now select Insert.

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: January 12, 2021.

Security update replacement information

This security update replaces previously released security update 4486750.

File hash information

File name SHA1 hash SHA256 hash
wacserver2019-kb4493160-fullfile-x64-glb.exe E3E42A921483B3BEC350D540C5DE21060071DE06 42336E623C1CC3C8029395B1ACBBBD3A53457F44596D749EA3566D1C0D089120

File information

Download the list of files that are included in security update 4493160.

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security