This security update resolves a Microsoft Excel denial of service vulnerability and Microsoft Excel remote code execution vulnerability. To learn more about the vulnerabilities, see the following security advisories:
Microsoft Common Vulnerabilities and Exposures CVE-2023-23396
Microsoft Common Vulnerabilities and Exposures CVE-2023-23399
This is build 16.0.10396.20000 of the security update package.
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. To install the update, follow the installation instructions on the download page.
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 5002309.
File hash information
Download the list of files that are included in security update 5002356.
Information about protection and security
Protect yourself online: Windows Security support
Learn how we guard against cyber threats: Microsoft Security