CVE-2026-16394

Modified Modified - Updated After Analysis

DOM Security Component Mitigation Bypass in Firefox

Publication date: 2026-07-21

Last updated on: 2026-07-22

Assigner: Mozilla Corporation

Description

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-21

Last Modified

2026-07-22

Generated

2026-08-10

AI Q&A

2026-07-21

EPSS Evaluated

2026-08-09

NVD

CVE-2026-16394

EUVD

EUVD-2026-46232

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 153.0.0 (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 is a mitigation bypass vulnerability in the DOM Security component of Firefox. It allows attackers to bypass security measures designed to protect against DOM-based attacks. The issue was resolved in Firefox version 153.

Detection Guidance

Detection of this vulnerability requires checking the installed version of Firefox. If the version is below 153, the system is vulnerable. Use commands like 'firefox --version' or check the application's about page to verify the version.

Impact Analysis

An attacker could exploit this to bypass security controls, potentially leading to unauthorized access to sensitive data or execution of malicious scripts in the context of a user's browser session.

Compliance Impact

The provided CVE data does not specify how this vulnerability affects compliance with standards like GDPR or HIPAA. The description only mentions a mitigation bypass in Firefox's DOM Security component without details on regulatory impacts.

Mitigation Strategies

Update Firefox to version 153 or later to address the DOM Security component mitigation bypass vulnerability.

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