Cornerstone 403 Forbidden from /cornerstone-endpoint

I’ve seen a few posts related to this but none have solved my problem. Cornerstone works on some pages, but not others. One page it’s known to not work on has an iframe in the content for a gmap embed. I noticed that in another post but what worked for them didn’t work for me. Here’s what I’ve tried:

  • Disabling all security plugins
  • WordFence > Performance to clear cache, but this menu doesn’t exist in the latest version.
  • Installing Transient Cleaner and clearing all transients

I’m working on getting access to the server logs, but right now all the info I have about the error is this.

Hi There,

While we are waiting on server logs, please check in too with your hosting provider. The 403 forbidden message is from your hosting, that means the data is not even reaching your site’s WordPress. It’s already blocked upon connecting and sending post data. Please do check in with your hosting provider to check their firewall or security settings.