Firefox and Tor Browser Vulnerability CVE-2026-6770 Enabled Cross-Site Tracking and User Fingerprinting
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A vulnerability tracked as CVE-2026-6770 enabled attackers to fingerprint Firefox and Tor Browser users, including those in Private Browsing mode or using Tor's New Identity feature. The flaw bypassed privacy protections designed to prevent cross-site tracking and user identification. Firefox version 150 and Tor Browser version 15.0.10 were released to address the issue. The bug affected both standard and Tor Browser deployments, compromising anonymity and tracking resistance mechanisms. No specific exploitation instances or attack vectors were detailed in the report.