KB5066586: Overview with user sentiment and feedback

Overview

This article lists the security issues and quality improvements included in this security update for Windows 10, version 1809 and Windows Server 2019.

The update includes fixes and quality improvements that are part of the following update: September 9, 2025—KB5065428 (OS Build 17763.7792).

The update addresses several issues, including:

• Fixes an issue with the Chinese Input Method Editor (IME) where private Unicode characters were shown incorrectly and did not meet GB18030 standard.
• Fixes an issue that affects USER32 Edit controls where surrogate pairs appear as empty boxes when text fields reach their length limit.
• Fixes an issue that affects PowerShell Remoting and Windows Remote Management (WinRM) where commands time out after 600 seconds.
• Removes the ltmdm64.sys fax modem driver, so fax modem hardware dependent on this driver will no longer work.
• Enforces a security hardening improvement by requiring use of Key Storage Provider (KSP) instead of Cryptographic Service Provider (CSP) for RSA-based smart card certificates.
• Automatically disables the preview feature for files downloaded from the internet in File Explorer to enhance security.

General Purpose

This security update for Windows 10, version 1809 and Windows Server 2019 includes a variety of fixes and improvements. It addresses issues with the Chinese Input Method Editor, USER32 Edit controls, PowerShell Remoting and WinRM, fax modem drivers, cryptography, and File Explorer. The update also includes servicing stack improvements to enhance the reliability of the update process. Overall, this update provides important security and quality improvements for these Windows versions.

General Sentiment

The general sentiment towards this update appears to be neutral to positive. While there are no known major issues reported, the update does make some significant changes, such as removing support for certain fax modem hardware and enforcing cryptography changes that could potentially cause compatibility problems for some users. However, the security and reliability improvements seem justified and necessary, especially with the upcoming Secure Boot certificate expiration that could affect many devices. As long as users are aware of the potential impact and take appropriate preparation steps, this update should be a worthwhile install for most Windows 10 1809 and Windows Server 2019 systems.

Known Issues

• None reported

Disclaimer: We take measures to ensure that AI-generated content is of the highest possible quality, but we cannot guarantee its accuracy and recommend that users do their own independent research. Generated on 2025-11-29 07:26 AM

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