Hackers Can Leverage Delivery Receipts on WhatsApp and Signal to Extract User Private Information

Security researchers have exposed a critical privacy flaw dubbed “Careless Whisper” that lets attackers monitor user activity on WhatsApp and Signal through silent delivery receipts, without alerting victims or needing prior contact. By crafting stealthy messages like reactions to nonexistent content or timed-out edits, adversaries trigger round-trip time (RTT) responses revealing device states, all exploitable […]

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