Device Activity Tracker is a cybersecurity tool/attack technique that covertly monitors user activity on messaging apps by exploiting delivery receipts in Signal and WhatsApp.
Overview
Device Activity Tracker is a cybersecurity tool/attack technique that covertly monitors user activity on messaging apps by exploiting delivery receipts in Signal and WhatsApp. Its key traits include stealthy operation and the ability to infer device presence and activity without accessing message content, highlighting a significant privacy risk in popular communications platforms.
Related Threat Clusters
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Privacy Flaw in Signal and WhatsApp Allows User Tracking via Delivery Receipts
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…
2 articles · Updated December 13, 2025
Recent Intelligence Reports
- Tool allows stealthy tracking of Signal and WhatsApp users through delivery receipts — Pogowasright · December 12, 2025