According to TeamSpeak:
We have just released a very important security update for the TeamSpeak 3 Client addressing a RFI (Remote File Inclusion) vulnerability. Please upgrade your desktop clients to version 18.104.22.168immediately. The update is available for Windows, Linux and OS X. Mobile clients for Android and iOS are not affected by this issue.
You can use the auto-update feature to grab this new release. If you need an installer, please refer to our Downloads page
=== Client Release 22.214.171.124 10 Oct 2015 ! Hotfix release to fix security vulnerability
We change the TeamSpeak server requirements to fit the TeamSpeak recommandation! UPDATE IS REQUIRED !!!