What does IndexedDB do in Firefox?

IndexedDB is a low-level API for client-side storage of significant amounts of structured data, including files or blobs. It's used by websites to store data locally in your browser.

Can this vulnerability still be exploited?

No, Mozilla patched this vulnerability (CVE-2026-6770) in Firefox 150, and the Tor Project incorporated the fix into Tor Browser 15.0.10. Keeping your browser updated is essential.

🕳️ Vulnerabilities & CVEs

Firefox's Secret Handshake: How a Tiny Glitch Unmasked Tor Users

Imagine walking into a party, shedding your coat and hat, and thinking you're invisible. Then, someone whispers your favorite childhood nickname. That's essentially what happened to Firefox users.

CVE Watch Apr 28, 2026 4 min read

Abstract digital fingerprint graphic overlaying a browser window

⚡ Key Takeaways

A Firefox vulnerability (CVE-2026-6770) allowed for user fingerprinting by exploiting the stable ordering of IndexedDB databases. 𝕏
The flaw impacted Firefox Private Browsing and Tor Browser's 'New Identity' feature, linking sessions that were meant to be isolated. 𝕏
Mozilla has patched the vulnerability in Firefox 150, and the Tor Project has applied the fix in Tor Browser 15.0.10. 𝕏

Published by

CVE Watch

Threat intelligence. Zero noise.

#cve-2026-6770 #firefox vulnerability #indexeddb #tor browser #user fingerprinting

Worth sharing?

Get the best Cybersecurity stories of the week in your inbox — no noise, no spam.

Originally reported by SecurityWeek

⚡ Key Takeaways

The 60-Second TL;DR

CVE Watch

Share this article

Worth sharing?

Related Stories

UNC6201 Ditches BRICKSTORM for Sneakier GRIMBOLT in Dell Zero-Day Heist

[CVE-2026-3844] Hackers Hit Breeze Cache in 170+ Attacks

[65% Privilege Escalation] Microsoft's Huge Patch Tuesday

[Alert] 100+ Malicious Chrome Extensions Steal Accounts

Stay in the loop