WhatsApp Enumeration Flaw Leads to Largest Data Leak of 3.5 Billion Users

First seen 2 Dec 2025, 18:33 UTC • Databreaches

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Researchers in Austria have identified a flaw in WhatsApp that allowed them to collect personal data from over 3.5 billion users, which they claim constitutes the largest data leak in history. The vulnerability enables users to look up others' details by entering their phone numbers, exposing sensitive information.

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WhatsApp Enumeration Flaw Leads to Largest Data Leak of 3.5 Billion Users

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