Summary
This security update resolves a Microsoft SharePoint Server remote code execution vulnerability and Microsoft SharePoint Server spoofing vulnerability. To learn more about the vulnerabilities, see the following security advisories:
-
Microsoft Common Vulnerabilities and Exposures CVE-2025-21344
-
Microsoft Common Vulnerabilities and Exposures CVE-2025-21348
-
Microsoft Common Vulnerabilities and Exposures CVE-2025-21393
Notes:
-
This is build 16.0.10416.20041 of the security update package.
-
To apply this security update, you must have the release version of Microsoft SharePoint Server 2019 installed on the computer.
Improvements and fixes
This security update contains an improvement in SharePoint Server 2019:
-
Adds a User-Agent header in the request to the Search Content Service (SCS) for hybrid search.
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 5002657.
File hash information
|
File name |
SHA256 hash |
|---|---|
|
sts2019-kb5002666-fullfile-x64-glb.exe |
B29511EAB8AEB73A44EB3D7B696064B93AFDA5FB966275F2E34ED8F9B7B0D6FF |
File information
Download the list of files that are included in security update 5002666.
Information about protection and security
Protect yourself online: Windows Security support
Learn how we guard against cyber threats: Microsoft Security
