Description of the security update for Office Online Server: October 8, 2019

Summary

This security update resolves a remote code execution vulnerability that exists in Microsoft Excel software when the software fails to correctly handle objects in memory. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2019-1331.

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

Known issues in this update

• After you install this security update, Office Online Server logging will be set to Verboseby default. We recommend that you change this setting to Mediumby running the following command:**Set-OfficeWebAppsFarm -LogVerbosity “Medium”**Note After you run the command, you have to restart the Office Online Service. To do this, run the following command:Restart-Service WACSM

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.

• Download security update 4475595 for the 64-bit version of Office Online Server

More information

Security update deployment information

For deployment information about this update, see security update deployment information: October 8, 2019.

Security update replacement information

This security update replaces previously released security update 4475528.

File hash information

File name	SHA1 hash	SHA256 hash
wacserver2019-kb4475595-fullfile-x64-glb.exe	669ECD9680D3D90F3C75FCA194AADFC36A3A4D2F	53D070E64C633AFA58A41CE6EE6EC6C07290FB3E44679FD36C0CFD77092F9480

File informationDownload the list of files that are included in security update 4475595.

How to get help and support for this security update

Help for installing updates: Protect yourself online

Help for protecting your Windows-based computer from viruses and malware: Microsoft Security

Local support according to your country: International Support