WhatsApp told media outlets that it had "high confidence" that journalists and activists were targeted by Paragon spyware and that they were "possibly compromised." It did not provide names of people it believed to be compromised.

Cancellato is the first target to come forward following the disclosure of a hacking campaign carried out using spyware allegedly made by Paragon Solutions, as WhatsApp claimed on Friday.

WhatsApp, used by millions of people around the world, says its users were hacked by the Paragon Solutions spyware company. The World's Host Marco Werman speaks with John Scott-Railton, a senior researcher at Citizen Lab,