Update to Drupal 7.43 makes Webform 4.12 submission fail for authenticated user

After done the security update Drupal 7.43 I had to recognize that our users have done a lot webform submissions. Without getting an error message, these submission are landed in nirvana! Just to say, the forms are one paged but huge. A lot of data is questioned, together with file uploads mostly of pictures and PDFs.
All these submission where allocated in the background to the none existent Webform node 0 (zero) instead of the correct related one (eg. 70, 82, etc.). So they were lost and not accessible by the GUI, eg, over Results-tab of Webform.
After checked out this fact, I was able to reallocate them directly in the database over phpMyAdmin.
But I have to lock the whole website for now due to this issue!
I think this is critical, because there is no feedback at all on this by the website to the user.
So users think all went right on their submission.
It may be, that there is a similar issue is reported from February 24, 2016 - 23:26 due to anonymous users can not upload files over Webform submissions, but that's out of my scope to decide on that.
Is there patch for that, or is a similar behaviour already known?