An issue was discovered in certain Apple products. iOS before 10.3 is affected. The issue involves mishandling of deletion within the SQLite subsystem of the "Safari" component. It allows local users to identify the web-site visits that occurred in Private Browsing mode.
Apple Security Advisory 2017-03-27-4 - iOS 10.3 is now available and addresses code execution, information disclosure, denial of service, and various other vulnerabilities.