Description of the security update for SharePoint Server 2019: April 9, 2024 (KB5002580)

Summary

This security update resolves a Microsoft SharePoint Server spoofing vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2024-26251.

Notes:

• This is build 16.0.10409.20027 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 and fixes for the following nonsecurity issues in SharePoint Server 2019:

• Fixes an issue in which duplicate configuration elements are added to SharePoint Web.config files every time that you run SharePoint upgrade. This activity eventually causes those files to exceed the Web.config file size limitation that’s configured in IIS. This issue generates multiple “HTTP 500.19 - Cannot read configuration file because it exceeds the maximum file size” error messages when you browse a SharePoint website. This fix removes the existing duplicate configuration elements and prevents future duplicates from being added.

• Fixes an unexpected exception in the aggregated newsfeed feature.

• Improves the reliability of Antimalware Scan Interface (AMSI) integration.
  This security update also contains a fix for the following nonsecurity issue. To fix this issue completely, you have to install KB 5002538 together with this update.

• Fixes an issue in which you cannot open PDF attachments from list items.

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 5002580 for the 64-bit version of SharePoint Server 2019

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 5002562.

File hash information

File name	SHA256 hash
sts2019-kb5002580-fullfile-x64-glb.exe	BB4F9CBACB2EBEB622ACFD6DBA38237119AB4F7275917C3708FFD703F97FE9B5

File information

Download the list of files that are included in security update 5002580.

Information about protection and security

Protect yourself online: Windows Security supportLearn how we guard against cyber threats: Microsoft Security

Change history

The following table summarizes some of the most important changes to this topic.Date	Description
May 29, 2024	Added an improvement for AMSI in the “Improvements and fixes” section.