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Hackers Target Delivery Receipts in Messaging Apps to Steal User Data

First seen 8 Dec 2025, 15:52 UTC • •

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ThreatCluster •March 12, 2026 at 13:27 UTC

Hackers have exploited a vulnerability in mobile instant messengers related to silent delivery receipts, allowing them to monitor users and steal private information. This issue affects users of various messaging applications, raising significant privacy concerns. The vulnerability was detailed in a research paper titled 'Careless Whisper.'

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