Description of the security update for SharePoint Server 2019: March 10, 2020

Applies to: SharePoint Server 2019


This security update resolves a cross-site-scripting (XSS) vulnerability that exists if Microsoft SharePoint Server does not correctly sanitize a specially crafted web request to an affected SharePoint server. To learn more about the vulnerability, see the following security advisories:

Note 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 improvements and fixes for the following nonsecurity issues in SharePoint Server 2019:

  • Users navigate to a document library and open a Links list in Job Access With Speech (JAWS) by using a keyboard shortcut (Alt+F7) to see all links on the page. Every document in the library contains the Open Menu link to open the Edit Control Block (ECB) menu. Therefore, it is not possible to know which document belongs to which link. This update fixes the issue.

    To fix this issue, you have to install update 4484277 together with this update.
  • Fixes an issue that prevents users from switching content type when they create items in a list.
  • Removes the Link command from the New menu in custom lists when content types are enabled.

Note To fix these issues, you have to install update 4484277 together with this update.

  • When you have a hyperlink column as the first column in your view, and you have a very long navigation list, the edit box for the hyperlink column in Quick Edit opens underneath the navigation pane. This makes it difficult to edit or add a value in the edit box.
  • Fixes an issue in which creating a site master fails if multiple authentication methods are used for the web application.
  • When you use the Edge browser, CSPReporting.aspx is requested multiple times during page loading when you access modern pages. This update fixes this issue.
  • Screen readers such as Narrator don't show an "alt" text entry for icons of Search buttons when you bulk edit multiple resources.
  • After you import an updated thesaurus into the Search Service Application, you may see a "something went wrong" error message when you search from the "Search Box".
  • When you use the Finnish locale version, the dates for Blog and List items don't render correctly. This update fixes this issue.
  • When you copy items that are declared as records through Windows Explorer, the copied items keep the record declaration status. This update fixes this issue.
  • Fixes an issue that causes content deployment jobs to fail if a document library contains a file that has multiple versions.

This security update contains fixes for the following nonsecurity issues in Project Server 2019:

  • After you edit a project in Project Web App, it may take a long time to save the project. This is especially true if there are many custom field values. This causes slower publishing, check-in jobs, and other related actions.
  • Editing a project in Project Web App or approving status updates uses the Project Calculation Service (PCS). In some situations, PCS crashes while it closes the given project. The crash detail is logged in the Unified Logging System (ULS) logs, and it resembles the following:

    "The worker encountered a very serious error and will shut down. Exception code was: 0xc0000005 (EXCEPTION_ACCESS_VIOLATION)."
  • Consider the following scenario:
    • You have an enterprise resource custom field.
    • You edit a resource and assign a value to the field.
    • You delete the enterprise resource field.
    • You edit the resource, and save your changes.

In this scenario, the process fails, and you receive the following error message:

"Unknown error has occurred"

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 security update deployment information: March 10, 2020.

Security update replacement information

This security update replaces previously released security update 4484259.

File hash information

File name SHA1 hash SHA256 hash
sts2019-kb4484271-fullfile-x64-glb.exe 1B885A816A56F1258A243D8FF3F54C59DE2F4B0D 6B509CB407B8A6948ED40718D53CAB638E3036E47F14D76B30E876CF51A4DDDE

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.

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security