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Windows 11 Update KB5127648 Disables Smart App Control Activation

Windows 11 Update KB5127648 Disables Smart App Control Activation

First seen 16 Oct 2026, 13:38 UTC • •
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ThreatCluster AI
ThreatCluster •October 16, 2026 at 13:39 UTC
  • •KB5127648 update may disable Smart App Control activation on Windows 11.
  • •Affected devices show the option grayed out if Smart App Control was previously disabled.
  • •Temporary workarounds involve registry edits and Group Policy adjustments.

Microsoft's KB5127648 Windows 11 security update may prevent users from enabling Smart App Control on affected devices running version 24H2 and later. The option to toggle Smart App Control remains grayed out for users who had previously disabled it. Devices where Smart App Control is already enabled are unaffected. Microsoft has not yet released a fix but has provided temporary workarounds for IT administrators, including registry modifications and Group Policy configurations. The issue also coincides with other problems caused by recent updates, including Remote Desktop failures for non-admin users and VPN connection issues. Users are advised to follow Microsoft's guidance to mitigate the impact until a permanent solution is available.

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Timeline

2026-10-16
KB5127648 update released
Microsoft released the KB5127648 security update for Windows 11, which may disable Smart App Control activation.
BleepingComputer
2026-10-16
Temporary workarounds provided
Microsoft shared registry modification and Group Policy settings as temporary solutions for affected IT administrators.
Feeds.4Sysops

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Common questions

Which Windows versions are affected?
Windows 11 devices running version 24H2 and later may experience issues with Smart App Control.
What are the temporary workarounds?
IT administrators can modify the registry or configure Group Policies to enable Smart App Control temporarily.
Is there a fix available?
No, Microsoft has not yet released a fix for the issue but is working on it.