Security Headers conflicting with Cornerstone

Hi there,
My cornerstone has stopped working. The tab on the editor has completely disappeared.
I have investigated further and we are trialing security headers and have found that we need additional policy sources in content-security-policy. The strange thing is when you inspect the source, it doesn’t tell me what is being blocked so its hard to pin point which policy needs adding.
Hope you can help with this?

Hi There @gemlangley

Thanks for writing in! It’s hard to guess without seeing the actual errors. First check our knowledge base section here and enable CORS.

Also your issue could be related to something else, as you can see on this thread (

If you’re still having difficulties to identify the issue, provide us with your WordPress login credentials along with FTP information in a secure note to investigate your issue further.


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