Originally Posted by xintensex
I m Not Rooted its Stock ??
My bad. I thought that as you are in the, "(Verizon) Galaxy S4 - All Things Root
", section of the forum, you might be rooted. In that case you are receiving the standard notification.
Seems that you're not the only one getting this...
4.3 Upgrade Samsung Security Issue
Security Notice After Update to 4.3
Something similar happened when Knox came out for the International version 5 or 6 weeks ago...
Android Samsung Galaxy S4 'Security Policy Update' Problems
Back then it was WhatsApp causing quite a few of those notices. However, Whatsapp has since updated their app and it may be another user app causing the problem.