Data Integration Hub 9.6.1 HotFix1 is a security fix. It introduces enhancements that tighten client and server security. Most of the enhancements are implemented on the server and have no impact on users. There are few enhancements that might affect system usage:
You can download the Hotfix from here.
Informatica Data Integration Hub - 9.6.1HF1 - Release Notes - (English)