VAAL TRIANGLE - WhatsApp is urging its 1.5-billion users to update to the latest version of its mobile app due to a major security vulnerability. The vulnerability allows spyware to be injected into a user’s phone through the app’s phone call function. WhatsApp says it is too early into its own investigations of the vulnerability to estimate how many phones were targeted. WhatsApp encouraged users to upgrade to the latest version of the app, as well as keep their mobile operating system up to date, to protect against potential targeted exploits designed to compromise information stored on mobile devices. The Financial Times (FT) reported that a vulnerability in WhatsApp allowed attackers to inject spyware on phones by ringing up targets using the app's phone call function. The spyware was developed by the Israeli cyber intelligence company NSO Group.