A Simple WhatsApp Security Flaw Exposed 3.5 Billion Phone Numbers

Posted By on Nov 19, 2025 |

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.

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Author: dasuberworm

Standing just over 2 meters and hailing from о́стров Ратма́нова, Dasuberworm is a professional cryptologist, entrepreneur and cage fighter. When he's not breaking cyphers and punching people in the face, Das enjoys receiving ominous DHL packages at one of his many drop sites in SE Asia.

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