# Windows 10 update tightens PowerShell signature validation

_Published Tuesday, November 10, 2026 at 10:08 PM EST · Security, Products · Latest · Tier 2 — Notable_

![Windows 10 update tightens PowerShell signature validation — Primary](https://www.bleepstatic.com/content/hl-images/2024/09/10/windows-10-gradient.jpg)

Microsoft released Windows 10 update KB5131096 with stricter encoding checks for PowerShell script signatures, alongside November security patches and other fixes. Scripts containing invalid UTF-8 encoding may now fail signature validation even if they were previously accepted. Affected scripts must be saved with valid UTF-8 encoding and a byte order mark, then signed again.

The update is available to Windows 10 Enterprise LTSC users and devices enrolled in the Extended Security Updates program. It also fixes an Intune policy configuration problem involving trusted Remote Desktop publishers and resolves remaining USB Audio Class 1.0 issues introduced by September security updates.

## Sources

- [BleepingComputer](https://www.bleepingcomputer.com/news/microsoft/microsoft-releases-windows-10-kb5131096-extended-security-update/)

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Canonical: https://techandbusiness.org/newswire/4rTVChvSv5febbBxSzZ6jR
Published: 2026-11-11T03:08:37.207Z
Story chronology: 2026-11-10T20:04:36.000Z
Retrieved: 2026-11-11T04:51:33.044Z
Publisher: Tech & Business (techandbusiness.org)