A serious vulnerability in WhatsApp allows anyone who is able to eavesdrop on WhatsApp connection to decrypt users messages. A computer science student at Utrecht University in The Netherlands has disclosed a serious issue in the encryption used to secure WhatsApp messages. WhatsApp has been plagued by numerous security issues recently, easily stolen passwords, unencrypted messages and even a website that can change anyones status. WhatsApp uses the same encryption key in both directions, another error that puts messages at risk, but is more difficult to exploit.”]
Source: https://securityaffairs.co/wordpress/18572/hacking/serious-whatsapp-flaw.html