Hi all,
I've updated the download to 2.1.936 - basically to null the file where I believe the exploit is coming from. I looked through the other files, and I think they look OK.
Please update as soon as possible - really the only updated file was core/lib/php-ofc-library/ofc_upload_image.php. Instead of deleting it, I patched it, so then it will get patched on an upload.
Sorry for all the trouble guys! Please be sure to look through your server and account very carefully - if you see something suspicious, delete it, or rename it to add a .txt extension so it can't be found, until you can verify if the file is safe or not.
Thanks!