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Known update issues

KB5066470 – known issues and fixes

There is no data from the Microsoft Security Update Guide for KB5066470 – for example for an optional preview update or an update from another vendor. Affected according to our entries: Microsoft Windows. Known issues with this update: 1 dated change.

0Open
0Workaround
0Fixed
1Dated change

← All known issues

Known issues with KB5066470

In effectDated changeFix script

Windows: NTLMv1-derived credentials for SSO restricted by default (October 2026 update)

Since the October 2026 security update (released 2026-10-13), Windows 11 (26H2, 26H1, 25H2, 24H2) and Windows Server 2025 block the generation of NTLMv1-derived credentials for Single Sign-On by default. This applies only to devices with Credential Guard disabled and the BlockNtlmv1SSO registry value not set. Microsoft states this is a planned hardening change, not a known issue. The change is now live.

Microsoft · Windows

Where the information comes from

We continuously read the vendors’ official sources, community reports and trade media and summarise them in our own words, with a link to the source:

  • Microsoft: Windows release health (Windows 10/11, Server 2016 to 2025), Windows message center, known issues of Microsoft 365 Apps (Outlook, Excel, Word, PowerPoint), Edge, Intune, Autopilot, Windows 365 and Entra Connect, Microsoft KB articles with timelines, Exchange and Windows IT Pro blogs, optionally Microsoft 365 service health and message center
  • other vendors: Veeam KB, Citrix (known issues), Ubuntu and Debian (regressions), Broadcom (VMware), Fortinet, Cisco, Mozilla, Let’s Encrypt
  • community (title, short excerpt and link only, without the names of the authors): Microsoft Q&A, Microsoft Tech Community (discussions), Veeam R&D Forums, Eleven Forum
  • targeted web research with AI (Claude), e.g. on the updates of the month – this also finds discussions on Reddit and in forums; such entries are labelled as community reports until the vendor confirms them
  • early warning from trade media (title and link only): Born’s Tech and Windows World, BleepingComputer, AskWoody, Windows Latest, Windows Central, gHacks, The Windows Club, Deskmodder, Dr. Windows, WindowsArea, Frankys Web, heise online

Summary and translation with AI (Claude by Anthropic) – without any data of visitors.

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