how do i stop the install of Windows update KB5121003?

Czahor, John 0 Reputation points
2026-09-08T12:16:05.3833333+00:00

The Windows 11 security update KB5121003 breaks my security application which controls building access. until i uninstall it, i cannot even log in to the application. after i uninstall the update automaticly re-installs. as my users do not have the ability to uninstall updates.

How do i block it from installing?

Windows for business | Windows Client for IT Pros | Devices and deployment | Install Windows updates, features, or roles
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  1. Marcin Policht 106.8K Reputation points MVP Volunteer Moderator
    2026-09-08T12:18:33.9166667+00:00

    You can block update KB5121003 by uninstalling it using administrator rights and then hiding it via PowerShell so Windows does not reinstall it automatically.

    First, uninstall the update. Press the Windows Key, type cmd, right-click Command Prompt, and select Run as administrator. Run the following command to remove the patch:

    wusa /uninstall /kb:5121003 /quiet /norestart

    Restart the computer after the uninstall completes.

    Next, hide the update using PowerShell. Since regular users cannot manage updates, an administrator must block the specific KB from being offered again. Open PowerShell as an administrator and install the update management module by running:

    Install-Module -Name PSWindowsUpdate -Force

    Then hide the specific update so Windows skips it by running:

    Hide-WindowsUpdate -KBArticleID KB5121003 -Confirm:$false

    More at https://techcommunity.microsoft.com/discussions/windows11/how-to-stop-this-windows-update/4468513

    If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.

    hth

    Marcin

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