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.
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
Information about protection and security
Protect yourself online: Windows Security support
Learn how we guard against cyber threats: Microsoft Security