Applies To.NET

Revised July 7, 2025: Updated 'How to get this update' section. 

Revised 11/15/23: to remove CVE details which were not affected by the .NET Framework November Security and Quality rollup.

Release Date:November 14, 2023

Version:.NET Framework 3.5 and 4.8.1

The November 14, 2023 update for Windows 11, version 22H2 and Windows 11, version 23H2 includes security and cumulative reliability improvements in .NET Framework 3.5 and 4.8.1. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the Prerequisites and Restart requirement sections.

Summary

Security Improvements

CVE-2023-36560 – .NET Framework Security Feature Bypass Vulnerability This security update addresses a security feature bypass vulnerability detailed in CVE-2023-36560.

CVE-2023-36049 – .NET Framework Elevation of Privilege Vulnerability This security update addresses a elevation of privilege vulnerability detailed in CVE-2023-36049.

Quality and Reliability Improvements

WPF1

- Addresses an issue to provide an appconfig mechanism to allow users to extend the list of allowed types in case of XAML/XPS parsing.

1Windows Presentation Foundation (WPF)

Known issues in this update

Microsoft is not currently aware of any issues in this update.

How to get this update

Install this update

Release Channel

Available

Next Step

Windows Update and Microsoft Update

No

See note

Windows Update for Business

No

See note

Microsoft Update Catalog

No

See note

Windows Server Update Services (WSUS)

No

See note

Note: This update is no longer available. At this time, no functional issues have been reported with this update. To ensure your device continues to receive the latest security updates and quality improvements, we recommend installing the most recent cumulative update.

File information

For a list of the files that are provided in this update, download the file information for cumulative update.

Prerequisites

To apply this update, you must have .NET Framework 3.5 or 4.8.1 installed.

Restart requirement

You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.

How to obtain help and support for this update

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