CVE-2026-16407

Undergoing Analysis Undergoing Analysis - In Progress

DOM Service Workers Mitigation Bypass in Firefox

Publication date: 2026-07-21

Last updated on: 2026-07-24

Assigner: Mozilla Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-21

Last Modified

2026-07-24

Generated

2026-08-10

AI Q&A

2026-07-21

EPSS Evaluated

2026-08-09

NVD

CVE-2026-16407

EUVD

EUVD-2026-46245

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	thunderbird	to 153.0 (exc)
mozilla	firefox	to 153.0.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
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: Service Workers component of Firefox. It allows attackers to bypass certain security measures, potentially leading to unauthorized actions or data access.

Detection Guidance

Detection of this vulnerability requires checking the Firefox version installed on your system. If you are running Firefox version 152 or earlier, your system is vulnerable. Update to Firefox 153 or later to mitigate the risk.

Impact Analysis

If exploited, this vulnerability could allow attackers to bypass security controls, potentially leading to unauthorized access to sensitive data or execution of malicious code 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 the DOM: Service Workers component fixed in Firefox 153.

Mitigation Strategies

Update Firefox to version 153 or later to address the DOM: Service Workers mitigation bypass vulnerability.

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