Privacy Vulnerability in Firefox and TOR Browsers
ID: cd54d1cd-81cb-596a-b460-a7fc08202675
STIX ID: report--cd54d1cd-81cb-596a-b460-a7fc08202675
Feed Name: Security Boulevard
Threat Score
A metadata-retrieval fingerprinting vulnerability in Firefox (impacting Tor Browser privacy) allowed unique, persistent browser fingerprints by presenting ordered database metadata with insufficient entropy. Mozilla patched the issue in Firefox 150 (released 21 April 2026) following responsible disclosure; no evidence of active exploitation is presented in the report.
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