Tagged as Phone Numbers

Security Stop-Press: WhatsApp Flaw Exposed Billions of Phone Numbers

Published 25 November 2025

Researchers have uncovered a privacy weakness in WhatsApp that allowed the confirmation of 3.5 billion active accounts simply by checking phone numbers. A team from the University of Vienna and SBA Research found that WhatsApp’s contact discovery system could be queried at high speed, letting them generate and test 63 […]

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