Name: CVE-2026-6774: Protection Mechanism Failure
Creator: Rapid7
Published: 2026-04-21T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-6774, CWE-693, CVSS 5.4, EPSS 0.00258

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

CVSS Details

CVSS 3.1 Base Score: 5.4
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Freebsd	—	Upgrade thunderbirdUpgrade firefox	Apr 30, 2026	Apr 28, 2026
Mfsa2026 30	—	Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 150.0	Apr 23, 2026	Apr 21, 2026
Mozilla Thunderbird	—	Upgrade to Mozilla Thunderbird version 150.0Upgrade to the latest version of Mozilla Thunderbird	Apr 23, 2026	Apr 21, 2026

Prioritise with Active Threat Intelligence

With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.

Explore Intelligence Hub

MDR Buyer's Guide

Global Threat Landscape Report

Grow your business

CVSS Details

Covered by Rapid7

Prioritise with Active Threat Intelligence