Technical Bulletin – Urgent June 2026 Windows Update Issue

Co-Existent County SPOCs and Technical Contacts:

Issue: The CWS/CMS application generates a 29956 error in certain situations when attempting to make a call to Word documents. This error prevents the user from data input as part of normal workflow processes.

Cause: Microsoft has confirmed that the issue has been caused by Microsoft’s June 2026 update (released on June 9, 2026), specifically the KB5094126 installation on Windows 11 desktops. Microsoft has confirmed this issue is present for multiple customers.

Workaround Solution: A temporary workaround from Microsoft is to uninstall KB5094126 on impacted systems. A permanent fix is expected to be released by Microsoft within the next few days.

Note: This issue and workaround does not apply to the Dedicated County workstations. The June 2026 Microsoft patch KB5094126 was not yet installed on the Dedicated County workstations.

Action Required

Co-Existent Counties that installed the June 2026 updates from Microsoft should, as a temporary workaround, are strongly advised to uninstall patch KB5094126 from their workstations, until Microsoft provides a permanent fix.

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