The screenshots get deleted after the application is closed and most users would think that this is the end of the story but there is a twist according to security researcher Jonathan Zdziarski who was able to recover deleted screenshots that would show him exactly what a user was doing at a given time.

This however is not the only privacy risk. Everything that gets at least temporarily stored on the could be recoverable including keyboard and Safari cache, deleted emails and pictures.

Someone does need physical access to the device to be able to recover data but it is possible. Will probably be only a matter of time before someone creates or edits a disk eraser so that it can wipe the unused space of the iPhone regularly.