Researchers tried plugging every possible phone number into WhatsApp's web app. They found they could collect 3.5 billion users' phone numbers, plus photos for half and profile text for more than a third, the biggest personal data exposure ever by some measures.
www.wired.com/story/a-simp...
A Simple WhatsApp Security Flaw Exposed 3.5 Billion Phone Numbers
By plugging tens of billions of phone numbers into WhatsApp’s contact discovery tool, researchers found “the most extensive exposure of phone numbers” ever—along with profile photos and more.
