The Real3D Flipbook Lite – 3D FlipBook, PDF Viewer, PDF Embedder plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'r3dfbsavethumbnailcallback' function in all versions up to, and including, 4.8. This makes it possible for authenticated attackers, with Author-level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible.

The Real3D Flipbook WordPress plugin before 5.4 does not sanitize or escape several flipbook editor fields before rendering them back in the admin editor, allowing users with the Author role and above to inject arbitrary web scripts that execute in the browser of any user who later opens the affected flipbook for editing, including administrators.