CVE-2026-6774

Received Received - Intake

Mitigation Bypass in Firefox DOM Security Component

Publication date: 2026-04-21

Last updated on: 2026-04-22

Assigner: Mozilla Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-04-21

Last Modified

2026-04-22

Generated

2026-07-06

AI Q&A

2026-04-21

EPSS Evaluated

2026-07-05

NVD

CVE-2026-6774

EUVD

EUVD-2026-24115

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 150.0 (exc)
mozilla	thunderbird	to 150.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-693	The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

Attack-Flow Graph

Executive Summary

This vulnerability is a mitigation bypass in the DOM (Document Object Model) security component of Firefox. It means that a security measure intended to protect the DOM was circumvented, potentially allowing unintended actions or access. The issue was fixed in Firefox version 150.

Impact Analysis

Exploitation of this vulnerability could allow an attacker to bypass security protections in the DOM, potentially leading to unauthorized access or manipulation of web content within Firefox. This could result in compromised user data or browser behavior.

Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 150 or later where the issue has been fixed.

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