Risky Bulletin Newsletter
April 27, 2026
Risky Bulletin: New fingerprinting technique can track Tor users
Presented by
News Editor
Firefox and Tor Browser users are advised to install the latest security patches to address a bug that can allow threat actors to track them across the internet.
The bug works in normal browsing mode, in private browsing windows, and, in the case of Tor, across different Tor sessions.
The issue, found by the team at FingerprintJS, resides in IndexedDB, a Firefox API that allows websites to store data inside a user's browser for future visits.