KB5094126 patch causing word integration issues

Question

After installing KB5094126 (June 9, 2026), our application's Word integration fails with a DISP_E_TYPEMISMATCH (0x80020005) / 'Type Mismatch' error during COM/OLE automation calls to Documents.Open(). Microsoft acknowledged this bug on June 16, 2026. We are requesting the enterprise workaround referenced in Microsoft's acknowledgment, and information on the fix timeline. Is there any ETA or update if Microsoft will provide a fix for this?

Answer 1

Hi Mike,

Checking in for any updates from your end. If you are satisfied by my answer, I would appreciate if you could accept the answer. Have a great day!

Answer 2

Hi Mike,

30+ reports are seen here:

https://learn.microsoft.com/en-us/answers/questions/5917867/after-installation-of-kb5094126-the-word-integrati

https://www.reddit.com/r/sysadmin/comments/1u31bje/kb5094126_breaking_word_integration_with_some/?rdt=38900

The fix for this should arrive with the C/D release, which happens on 4th week of the month since it is widespread.

I’m eager to hear back and work together to find a solution.

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Answer 3

No information is available in the provided context about KB5094126, a DISP_E_TYPEMISMATCH / 0x80020005 error on Documents.Open, or any enterprise workaround or ETA for a fix related to that specific update.

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References:

• BUG: Automation client receives an error message or crashes when the client calls the Find object in Word
• Fixes or workarounds for recent issues in Word for Windows
• Outlook, Word, or OneNote unexpectedly close when typing
• Classic Outlook mail merge hangs trying to initialize Word
• When opening a Word document, users might get a Visual Basic dialog box with Runtime error 4707
• Classic Outlook and Microsoft 365 applications crashing on Windows Server 2016
• Users get the message "Location is turned off in system settings" when working with Word files in Windows
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• how fix run into an error problem - Microsoft Q&A its showing ''We're sorry, but word has run into an error that is preventing it from working correctly. word will need to be closed as a result. Would you like us to repair now?''
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