Description of the security update for Outlook 2016: August 11, 2026 (KB5002755)

Applies To

Outlook 2016

Summary

This security update resolves a Microsoft Outlook Spoofing vulnerability, Microsoft Outlook Remote Code Execution vulnerability, and Microsoft Office Word Remote Code Execution the vulnerability. To learn more about the vulnerabilities, see the following security advisories:

Note

To apply this security update, you must have the release version of Outlook 2016 installed on the computer.

Be aware that the update in the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2016. It doesn't apply to the Office 2016 Click-to-Run editions, such as Microsoft Office 365 Home. (See What version of Office am I using?)

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.

Download security update for Microsoft Outlook 2016 (KB5002755)

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 5002683.

File hash information

File name	SHA256 hash
outlook2016-kb5002775-fullfile-x86-glb.exe	1AA6E2C785B71C4BE25120BA248E3DAB6AB91A71914413989C8DDA2DC6D1BB24
outlook2016-kb5002775-fullfile-x64-glb.exe	EB3E4DABD91CE626134067E4393CA79640ECC9F2EAD788A3602C57420AA0D058s

File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.

For all supported x86-based versions of Outlook 2016

Download the list of files that are included in security update 5002755

For all supported x64-based versions of Outlook 2016