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Known update issues

Windows 11 24H2 and later: Smart App Control can't be turned on after KB5127648

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Community report – not yet confirmed by the vendor: users or trade media report on it (forums, Q&A sites, Reddit, web research), but the vendor has not confirmed the issue (yet). Use this information with caution.

Summary

After installing KB5127648, Smart App Control can reportedly no longer be turned on. This is reported by users and news sites, not yet confirmed by the vendor in the sources available to us. No fix is known yet.

Symptoms

The Smart App Control option is greyed out if it was turned off before the update. Devices where Smart App Control is already on are not affected.

Affected

  • Windows 11 24H2 and later
  • Devices with KB5127648 installed and Smart App Control turned off

Workaround

No workaround known. News reports mention a registry or Group Policy workaround, but the available excerpts do not give exact setting names, so none can be listed here.

Fix

Not fixed yet.

Recommendation

If Smart App Control is on, leave it on. Where it is off and should be enabled, wait for vendor guidance and check the Microsoft release health page for KB5127648 before changing registry or policy settings. Do not roll out workarounds from unverified sources.

Reports from the community and trade media

Reports from forums, Q&A sites, Reddit and trade media – linked only, without the names of the authors; the vendor’s statement is authoritative.

Sources

Compiled from community reports and web research and translated with AI (Claude) – not yet confirmed by the vendor. The vendor’s statements are authoritative. Updated 1 Nov 2026, 17:04.

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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