US Border Patrol Is Spying on Millions of American Drivers

Eight years after a researcher warned WhatsApp that it was possible to extract user phone numbers en masse from the Meta-owned app, another team of researchers found that they could still do exactly that using a similar technique. The issue stems from WhatsApp’s discovery feature, which allows someone to enter a person’s phone number to see if they’re on the app. By doing this billions of times—which WhatsApp did not prevent—researchers from the University of Vienna uncovered what they’re calling “the most extensive exposure of phone numbers” ever.