To install the update, follow the installation instructions on the download page. For deployment information about this update, see Deployments - Security Update Guide. This security update replaces previously released security update 5002742.

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Use Microsoft Update to automatically download and install the update. This update is also available for manual download and installation from the Microsoft Download Center. If you're not sure which platform (32-bit or 64-bit) you're running, see Am I running 32-bit or 64-bit Office?

To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2025-47171. 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.

Learn about the standard terminology that is used to describe Microsoft software updates. The Office System TechCenter contains the latest administrative updates and strategic deployment resources for all versions of Office.

Disabling Secure Boot significantly reduces device protection, removes safeguards against boot‑level malware, and can create new security and compliance risks. The recommended path is to ensure your device receives the updated 2023 Secure Boot certificates and any required OEM firmware updates.

Learn about the standard terminology that is used to describe Microsoft software updates.

Learn about the standard terminology that is used to describe Microsoft software updates. The Office System TechCenter contains the latest administrative updates and strategic deployment resources for all versions of Office.

To apply this security update, you must have the release version of Microsoft SharePoint Server Subscription Edition installed on the computer. This security update contains fixes for the following nonsecurity issues in SharePoint Server Subscription Edition:

Follow these steps to reset your Microsoft account password. Have something to say? Need help with an Xbox console, an Xbox game, or Xbox network? Find out how to get in touch with us.