12/17/2025
A newly revealed flaw in WhatsApp and Signal allows attackers to silently track users in real time and even drain their phone batteries and data. Security researchers warn that by exploiting delivery receipts and measuring round‑trip times, adversaries can monitor over 3 billion users worldwide simply by knowing their phone number, uncovering details such as when someone is home, asleep, or actively online—all without triggering notifications. The vulnerability, dubbed Silent Whisper, highlights a fundamental weakness in the messaging protocols and raises urgent concerns about privacy and resilience against stealth surveillance.
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A publicly released tool can exploit a vulnerability in WhatsApp and Signal’s delivery receipts to secretly track the real-time activity of over three billion users, while also draining battery and data.