CORS errors on multiple sites appearing recently

I remember seeing something in a recent cpanel update about XSS hardening. Since that update two different clients have come to me recently with issues that seem to point to the same underlying error. I will detail both cases below and hopefully someone will be able to see the connecting problem. I'd like to know how to fix this, whether it be a problem in the website code or whether I can adjust something on these accounts to allow these products to continue to work properly. Site 1- a magazine site using a plugin to display PDF content in a flipbook format The site has worked fine for years but as recently as this last chain of Joomla and cpanel updates we get CORS errors. If a user follows a link to ' from origin ') then it loads normally. We have never had this issue until recently. Site 2- a virtuemart store site running on Joomla In this case we wanted to turn on a feature in VM's PayPal to allow us to accept PayPal Credit. Again, the site worked fine for years before, but when we turn on this credit option the one page checkout form starts throwing the same kind of CORS error: Access to XMLHttpRequest at '') from origin '

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