Description of the security update for SharePoint Enterprise Server 2016: September 10, 2024 (KB5002624)

Summary

This security update resolves a Microsoft SharePoint Server remote code execution vulnerability, and Microsoft SharePoint Server denial of service vulnerability. To learn more about the vulnerabilities, see the following security advisories:

• Microsoft Common Vulnerabilities and Exposures CVE-2024-38018

• Microsoft Common Vulnerabilities and Exposures CVE-2024-38227

• Microsoft Common Vulnerabilities and Exposures CVE-2024-38228

• Microsoft Common Vulnerabilities and Exposures CVE-2024-43464

• Microsoft Common Vulnerabilities and Exposures CVE-2024-43466

This public update delivers Feature Pack 2 for SharePoint Server 2016. Feature Pack 2 contains the following feature:

• SharePoint Framework (SPFx)

This public update also delivers all the features that were included in Feature Pack 1 for SharePoint Server 2016, including:

• Administrative Actions Logging

• MinRole enhancements

• SharePoint Custom Tiles

• Hybrid Taxonomy

• OneDrive API for SharePoint on-premises

• OneDrive for Business modern user experience (available to Software Assurance customers)

The OneDrive for Business modern user experience requires an active Software Assurance contract at the time that the experience is enabled, either by installation of the public update or by manual enablement. If you don't have an active Software Assurance contract at the time of enablement, you must turn off the OneDrive for Business modern user experience.

For more information, see the following Microsoft Learn articles:

• New features included in the November 2016 Public Update for SharePoint Server 2016 (Feature Pack 1)

• New features included in the September 2017 Public Update for SharePoint Server 2016 (Feature Pack 2)

Improvements and fixes

This security update contains fixes for the following nonsecurity issues in SharePoint Enterprise Server 2016:

• Fixes the known issue in KB 5002618 in which some SharePoint PowerShell cmdlets don't function correctly because the Microsoft.SharePoint.ApplicationPages.SPThemes class is marked as unsafe in all Web.config files.

• Fixes an issue in which the business data connectivity (BDC) features don't work correctly after you install the latest .NET cumulative updates.

Known issues in this update

• After you apply this update, you might experience an issue that affects the deserialization of custom types that inherit from IDictionary. For more information, see Certain types that inherit from IDictionary are blocked from deserialization (KB5043462).

• You might experience an issue in which SharePoint workflows can't be published because the unauthorized type is blocked. This issue also generates event tag "c42q0" in SharePoint Unified Logging System (ULS) logs.
  
  To work around this issue, register the safe types in the Web.config file. You can look for event tag "c42q0" in ULS logs to find the blocked type. If the type and assembly are safe, add the type to the authorized list in the Web.config file. For example:

  <System.Workflow.ComponentModel.WorkflowCompiler>
     <authorizedTypes>
       <targetFx version="v4.0">
          <authorizedType Assembly="Microsoft.SharePoint.WorkflowActions, Version=16.0.0.0, Culture=neutral, PublicKeyToken=null" Namespace="Microsoft.SharePoint.WorkflowActions.WithKey" TypeName="*" Authorized="True" />
      </targetFx>
     </authorizedTypes>

How to get and install the update

More information

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security