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Applies to:

Microsoft .NET Framework 4.8

Summary

A remote code execution vulnerability exists in .NET software if the software fails to check the source markup of a file. An Authentication Bypass vulnerability exists in WCF and WIF, allowing signing of SAML tokens with arbitrary symmetric keys. This vulnerability enables an attacker to impersonate another user. The vulnerability exists in WCF, WIF 3.5 and later in .NET Framework, WIF 1.0 component in Windows, WIF Nuget package, and WIF implementation in Sharepoint. An information disclosure vulnerability exists if Exchange and Azure Active Directory allow entities to be created although the Display Names contain non-printable characters.

To learn more about these vulnerabilities, go to the following Common Vulnerabilities and Exposures (CVE):

Known issues in this update

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

How to get this update

Install this update

To download and install this update, go to Settings, Update & Security, Windows Update, and then select Check for updates.

This update will be downloaded and installed automatically from Windows Update.
To get the standalone package for this update, go to the Microsoft Update Catalog website.

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4506986.

Information about protection and security

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