Cyberinsider Privacy Flaw in Signal and WhatsApp Allows User Tracking via Delivery Receipts
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A new tool named Device Activity Tracker exposes a privacy flaw in WhatsApp and Signal, enabling attackers to monitor user activity using only their phone number. This vulnerability leverages delivery receipts, which are typically benign, to covertly track users. The research originates from the University of Vienna and SBA Research.
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