A major security flaw was discovered in Apple's FaceTime service today. It actually allowed users to hear the audio of the person they were calling before they even picked up the phone. Needless to say, it's a major privacy concern.
The bug was pretty easy to exploit too. All you had to do was make a FaceTime video call with someone, choose to add another person to the call while it's still dialing, and then add your own phone number. You'd then hear the audio of whoever was on the other end, even though they never picked up.
Needless to say, Apple was pretty swift to act, and Group FaceTime has been shut down for the time being. Presumably, we'll see a security fix sooner rather than later, and Apple told iMore that there will be a fix later on this week.
"We're aware of this issue and we have identified a fix that will be released in a software update later this week."
Group FaceTime has been available on iOS devices since iOS 12.1 was released in October, although the bug is also present on macOS. All devices should be affected, and presumably, you'll need the upcoming security fix if you ever want to make Group FaceTime calls again.