To the right of the events link on the main page bar I see a link saying edit. When I click it takes me to something it says is the Mises.org Content Management System. Was this supposed to happen? I have the power to upload pdfs it seems…
Yikes, that’s funny. Right after this post I go back to the main page and the link’s dissapeared! 
Sometimes it pays to lie low.
More than likely someone is working on the site. The global CMS access was likely a quick mistake that was immediately rectified. The timing of your post here was probably coincidental.
Correct. I think the site’s caching system cached an admin view and served to a non-admin.