"WhatsApp encourages people to upgrade to the latest version of our 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," a spokesman said.

"We are constantly working alongside industry partners to provide the latest security enhancements to help protect our users."

The Financial Times reported that a vulnerability in WhatsApp allowed attackers to inject spyware on phones by ringing up targets using the app's phone call function. It said the spyware was developed by Israeli cyber surveillance company NSO Group.

Read also: Users of these phones must say goodbye to WhatsApp

Asked about the report, NSO said its technology is licensed to authorized government agencies "for the sole purpose of fighting crime and terror," and that it does not operate the system itself.

"We investigate any credible allegations of misuse and if necessary, we take action, including shutting down the system. Under no circumstances would NSO be involved in the operating or identifying of targets of its technology, which is solely operated by intelligence and law enforcement agencies," the company said.

"NSO would not or could not use its technology in its own right to target any person or organization, including this individual." 

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