https://thenextweb.com/security/2019/10/07/signal-patches-android-bug-that-allowed-hackers-to-answer-calls-on-your-behalf/

Popular encrypted messaging app Signal has fixed a crucial flaw in its Android app that could’ve allowed bad actors to answer calls on your behalf. What’s more, it needed no intervention from your end.

Google’s Project Zero team, which uncovered the bug on September 28, said it only affects audio calls, as the video option needs to be manually enabled for all incoming calls.