Researchers discover security vulnerability in WhatsApp

Global Collection of User Data Was Possible Through a – Now Resolved – Privacy Vulnerability.

Our researchers Gabriel Gegenhuber and Aljosha Judmayer discovered a vulnerability to confirm 3.5 billion phone numbers and other data.

You can read all details at the official Press Release by University of Vienna.

Paper: Hey there! You are using WhatsApp: Enumerating Three Billion Accounts for Security and Privacy at NDSS 2026

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