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9.5 — CRITICAL

Firefox flaw enables cross-site tracking, undermines Tor Browser defenses

📅 28 April 2026 at 09:28 UTC📰 Cyber InsiderView original source ↗
Firefox flaw enables cross-site tracking, undermines Tor Browser defenses

A newly disclosed vulnerability in Firefox and Tor Browser allowed websites to generate a stable, process-level identifier using IndexedDB, undermining private browsing protections and cross-site isolation. The issue has been fixed in recent Firefox releases following responsible disclosure to Mozilla. The Tor Browser, which is built on top of the Gecko engine and inherits core … The post Firefox flaw enables cross-site tracking, undermines Tor Browser defenses appeared first on CyberInsider.

🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview

A previously unknown vulnerability in Firefox and Tor Browser allowed websites to generate a stable, process-level identifier using IndexedDB, undermining private browsing protections and cross-site isolation.

⚙️Technical Details
💥Impact Assessment
Severity: critical
🛡️Recommended Actions
1Update to the latest version of Firefox or Tor Browser as soon as possible.
2Restarting the browser process can temporarily mitigate exposure, as the identifier resets on full restart.
3Use alternative browsers that do not rely on IndexedDB API for tracking.
📦Affected Products
Product Name:FirefoxTor BrowserAffected Versions:150ESR 140.10.0

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