The Divi Form Builder plugin for WordPress versions 5.1.8 and prior contains an unauthenticated arbitrary file upload vulnerability in the do_image_upload() AJAX handler. The user-controlled acceptFileTypes POST parameter is injected unsanitized into a PHP regex for file extension validation. By supplying acceptFileTypes=phtml the constructed regex accepts .phtml files while the plugin's .htaccess only blocks .php, so Apache executes .phtml files as PHP. The required nonce (fb_nonce) is publicly embedded in any page containing a Divi form via the de_fb_obj JavaScript object. Uploaded shells land in /wp-content/uploads/de_fb_uploads/. Fixed in 5.1.9.
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