The 2.3.0 system update was released on May 15, 2017. This update was released for all regions.

Security flaws fixed: unknown.

Change-log

This is the official changelog from Nintendo regarding this update:

Improvements Included in Version 2.3.0

  • General system stability improvements to enhance the user's experience

System Titles

It's unknown exactly what titles were updated, however the browser was not updated going by the WifiWebAuthApplet user-agent.