In 2016, WhatsApp finally enabled complete end-to-end encryption for both chats and video calls to ensure that no one but the intended recipient can decipher contents of their communications. Unfortunately, it's come to light that WhatsApp's system has been plagued by a major vulnerability which was discovered by Tobias Boelter, a cryptography and security researcher at the University of California, Berkeley.
In an interview with the British newspaper The Guardian, Boelter said the backdoor could let Facebook read end-to-end encrypted content, meaning the social network could be complied with court orders to make decrypted messages available to law enforcement and other government agencies
UPDATE: We've received a response from WhatsApp regarding the alleged backdoor.