Excel - Options - Addins : how to disable access Inside COM addins?

Question

For risk reasons, (Financial/ bank topic) we 'd like to know if we can disable the access to COM add-ins in the excel options.

Screenshot of the COM add-ins windows => is it possible (with regesit?) to disable the whole windows or at least the ADD button?

thanks and regards.

Answer 1

Hi @Gain, S. (Stephan),

You can try this registry key to block all com add-ins (If RestrictToList is set to 1, but you do not enable any add-ins using the List of managed add-ins policy, all COM add-ins are disabled.):

Key: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\x.0<application>\Resiliency

DWORD: RestrictToList

Value: 1

You can get the information from this article:

https://learn.microsoft.com/en-us/microsoft-365/troubleshoot/group-policy/office-add-in-not-loaded

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Answer 2

I cannot see my previous answer, strange. I did try the registry update, result is less com lines available, but the Add button is still enable and so a hacker can still use this to get in the system.