Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
Apple to Fix Major FaceTime Bug That Lets People Covertly Hear Your Audio and See Your Video 'Later This Week' [Updated]
In a statement made to Axios, Apple said it was aware of the issue and has identified a fix that will be "released in a software update later this week."
It's not clear when "later this week" is, but Apple will presumably address the bug as quickly as possible because it us a huge privacy violation. While it was originally thought that it only allowed someone who called to hear your FaceTime audio, pressing the power button on a device also allows video to be seen.
These FaceTime calls can be made covertly and are super easy to initiate, requiring only a few steps as outlined in our original post on the subject.
All you need to do is initiate a FaceTime call and add your own number to it while it's ringing, forcing a connection with another person. There is no way to stop someone from using FaceTime this way other than disabling FaceTime on your devices.
Update: Apple appears to have temporarily addressed the issue by disabling Group FaceTime calls server side. On Apple's System Status page, Group FaceTime is now listed as unavailable.