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WhatsApp Security Flaw Exposes 3.5 Billion Phone Numbers
First seen 18 Nov 2025, 16:14 UTC
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A security flaw in WhatsApp allowed researchers to extract phone numbers of 3.5 billion users. The exploit involved systematically checking numbers through the app's discovery feature, revealing profile photos for 57% and profile text for 29% of accounts. Meta was alerted to the vulnerability in April 2025 and implemented stricter rate-limiting by October 2025.
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