zoom cpthost.exe is using exchcsp.dll from an unknown publisher

Hello @pepeac 

I have seen this issue resolve by running a clean zoom which can be found at the bottom of this support article: https://support.zoom.us/hc/en-us/articles/201362163-Mass-Installation-and-Configuration-for-Windows Once that has been run head to zoom.us/download and download the 32 or 64 bit installation for your device. I hope this helps and please make sure to mark the solution as accepted if this information is what you needed.

It is happening after recent ZOOM update. Suddenly it starts appearing to multiple users. Clean un-install & install does not resolve the issue. ZOOM development team need to fix this.

I am constantly getting the following message - cpthost.exe is using GSafecsp.dll from an unknown publisher zoom message and I can't share screens on zoom so think this is related. Any fixes?

I am getting this error too (cpthost.exe is using exchcsp.dll from an unknown publisher) and it stops me from easily sharing my screen. I need a fix before I run my Zoom class at 09:30 BST this morning - URGENT HELP NEEDED!

I am getting the same error (but with another dll file) - could someone help with resolving this issue?

I have the same problem  

CptHost.exe is using EXCHCSP.DLL from an unknown publisher. Are you sure you want to run this software?  It stated happening after Best Buy did an update on my computer. How do I resolve this

This also happens to me. 

I have had this issue until now. I have been getting the popup error described for some time. Today i tried to share screen and that failed, then zoom crashed.

I think i have it working for me now. 

EXCHCSP.DLL is part of Microsoft Office, i am not sure why zoom should depend on it, that is strange. 

In my case i have a very old version of Microsoft Office installed, Word 2003. It is using EXCHCSP.DLL which came with word 2003. Likely that was not properly signed or signing is out of date. 

So what i did are to rename the offending file which was here

C:\Program Files (x86)\Microsoft Office\OFFICE11\EXCHCSP.DLL

I just renamed it to EXCHCSP0.DLL

This seems to have fool the zoom stuff and it no longer connects to this DLL.

All seems good, no more popup, and share screen working.

I think zoom should look at this and see why it is depending on this file.

All this said i word seems to be still working, i hope i have not broken something in word by renaming a file that it needs.

You may need administrator rights to do this.

Thanks. This stops the warning.