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Known update issues

KB5126657 – known issues and fixes

KB5126657 is a Microsoft update from Patch Tuesday October 2026, released on 13 Oct 2026. According to the Security Update Guide it fixes 878 vulnerabilities (Windows). Affected according to our entries: Microsoft Windows 11 File History. Known issues with this update: 1 open.

1Open
0Workaround
0Fixed
878Vulnerabilities fixed

← All known issues

Known issues with KB5126657

OpenKnown issueCommunity report

Windows 11 File History: Last copied date and Previous Versions broken after updates

Users report that File History copies files to the target drive, but the "Last copied on" date does not update and Previous Versions shows no entries. This is reported by users, not yet confirmed by the vendor. A related September 2026 File History bug was reportedly resolved by Microsoft, but no vendor source confirms the remaining problem.

Microsoft · Windows 11 File History

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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