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Known update issues

KB5127646 – known issues and fixes

KB5127646 is a Microsoft update from Patch Tuesday October 2026, released on 13 Oct 2026. According to the Security Update Guide it fixes 234 vulnerabilities (Windows). Affected according to our entries: Microsoft Windows 11, Version 26H2. Known issues with this update: 1 fixed.

0Open
0Workaround
1Fixed
234Vulnerabilities fixed

← All known issues

Known issues with KB5127646

FixedKnown issue

Windows 11 26H2: Black screen or desktop does not load after sign-in (fixed in KB5127648)

After installing Windows 11, version 26H2 and subsequent updates, some devices may fail to load the desktop after sign-in. The issue was mainly observed on Azure Virtual Desktop (AVD) hosts using FSLogix, more often with some existing user profiles. Microsoft resolved it with the updates released on 2026-10-13 (KB5127648) and later.

Microsoft · Windows 11, Version 26H2

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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