Description of the security update for SharePoint Server 2019 Language Pack: March 9, 2021 (KB4493231)

Summary

This security update resolves a Microsoft SharePoint spoofing vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2021-24104.

Improvements and fixes

This update removes the Document and List Static Data Fixed SampleJob timer job from SharePoint Server. This timer job is intended for SharePoint Online use only. Therefore, it should not be included in SharePoint Server.

This security update also contains fixes for the following nonsecurity issues in SharePoint Server 2019. To fix these issues, you have to install KB 4493230 together with this update.

• Fixes an issue in which all the subsites themes will be changed at the same time when a root site theme is changed.

• Fixes an issue in which some texts in the Chinese (Traditional) language version of SharePoint Server 2019 appear as the Chinese (Simplified) language in modern UI.

• Fixes an issue in which Try link is shown as a link in the New link pane if the Address field is empty in high contrast mode.

• Fixes an issue in which the focus is not clear on the back button in the Create Site pane.

• Fixes an issue in which there is no close button to close the Create a site dialog box by using the keyboard.

• Fixes an issue in which the Rich Text toolbar disappears when you input many lines of text.

• Fixes an issue in which DatePicker doesn't render in the modern item properties pane in document libraries.

• Fixes an issue in which a list folder can't be renamed successfully in the modern UI.

• Fixes an issue in which a folder in a modern view document can't be opened after you install the ListView Command Set extension.

• Fixes an issue in which in a modern view custom list, the preview of a lookup item doesn't work from the details pane and the preview is truncated in the list view.

• Fixes an issue in which the left navigation pane disappears when you create a sub link and then delete it.

• Fixes an issue in which link items are missing when you edit the left navigation pane.

• Fixes an issue in which the Change the look Panel doesn't have a close button.

• Fixes an issue in which the focus is not visible in the site Activity tile.

• Fixes an issue in which the focus status is missing when you select the More Option button in the communication site left pane and then select an option item on the popup menu.

• Fixes an issue in which the focus status is missing when you select the Following or Not Following button.

• Fixes an issue in which Narrator doesn't announce anything about the More Option button in the site's left pane.

• Fixes an issue in which the required aria attributes are missing in the Create List panel.

• Fixes an issue in which Narrator does not announce the number of items and the order number of each item in Featured Links.

• Fixes an issue in which the Get the mobile app button doesn't have sufficient color contrast.

Known issue in this update

Issue

After you install this update, you can no longer delete list item attachments in the item detail panel.

Status

Microsoft is investigating this issue and will post more information in this article when a fix becomes available.

Workaround

To work around this issue, see KB 5003294.

How to get and install the update

More information

Information about protection and security

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Learn how we guard against cyber threats: Microsoft Security