Forms Attachment control allows attachments with prohibited characters

Issue

In Nintex Forms, attachment control may not be validated for name length and special characters before submitting form.

Resolution

Upgrade to Nintex Form 2013 hotfix version 2.11.3.20 or Nintex Forms July 2018 release.
Upgrade to Nintex Form 2016 hotfix version 4.3.2.20 or Nintex Forms July 2018 release.