Hello Kim,
The security problem is solved in both versions 4 and 5. If you are using vulnerable version of 4.x family, you can download 4.7.16 on a
legacy download page. License keys of 4.x version will work for it, so this is a free update.
Could you explain what problem do you get with new Image Uploader version in more detail?
Sincerely yours,
Dmitry Sevostyanov.