Description of the security update for SharePoint Enterprise Server 2016: September 10, 2019

This security update resolves an elevation of privilege vulnerability that exists in Microsoft SharePoint. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2019-1260.

Note To apply this security update, you must have the release version of Microsoft SharePoint Enterprise Server 2016 installed on the computer.

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 Auditing (preview)
• 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 Docs 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)

• You randomly get a FedAuth cookie even though you have enabled Windows Authentication as the only authentication provider on your web application.

Note To fix this issue completely, you must install KB4475590 together with this update.