WhatsApp has discovered a vulnerability in its system which allowed attackers to install spyware designed by NSO Group on people's phones, the Financial Times writes. Both iPhone and Android models were targeted, and the attackers could install the surveillance software simply by using the app’s call option. Following the call, which the victim didn’t need to pick up, the spyware would be installed on the device, and the call itself would disappear from the log.
WhatsApp has rolled out an update which should fix the issue. The company urges all users to download the latest update.