Yesterday, Apple released another update to iOS 9: iOS 9.3.5. This is a major security release, as it closes 3 security holes . . .
that would “allow someone to hijack an iOS device and control or monitor it remotely. Hijackers would have access to the device’s camera and microphone, and could capture audio calls even in otherwise end-to-end secured apps like WhatsApp. They could also grab stored images, tracking movements, and retrieve files.”
If you have a jailbroken iPhone or iPad, don’t install this immediately as it will remove your jailbreak. Expect to see an update on Cydia in the near future with fixes.
Here’s the full story as covered by MacWorld.