The software that powers the HTML Editor within cPanel's File Manager, CKEditor, is out of support under its current license model by the upstream vendor and has been removed from cPanel. The future replacement is outlined here.
While the security concerns are currently considered theoretical, we wanted to mitigate the risk for our customers. [More information here.]
For those customers that would like to continue to use CKEditor, please see the following support article. [More information here]
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Please note that the "Edit" functionality is still available. This change only pertains to the WYSIWYG "Edit HTML" button within File Manager. More information about the cPanel File Manager can be found here.