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The original was posted on /r/technology by /u/Hrmbee on 2025-11-19 03:47:47+00:00.
Original Title: 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