Description of the security update for Office Online Server: September 08, 2026 (KB5002910)

Applies To
Office Online Server

Summary

This security update resolves Microsoft Excel remote code execution vulnerability and Microsoft Excel Information Disclosure vulnerability. To learn more about the vulnerabilities, see the following security advisories:

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 Deployments - Security Update Guide.

Security update replacement information

This security update replaces previously released security update 5002895

File hash information

File name SHA256 hash
wacserver2019-kb5002910-fullfile-x64-glb.exe B89DEDF0ED890AB73E8824230F3D70DA236C584B4D00BA197CA6C7A845A28279

File information

Download the list of files that are included in security update 5002910

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security