CVE-2026-92039

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DOM Notifications Component Mitigation Bypass in Firefox

Publication date: 2026-09-15

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

Mitigation bypass in the DOM: Notifications component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, and Thunderbird 156.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-15

Last Modified

2026-10-05

Generated

2026-10-05

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92039

EUVD

EUVD-2026-78502

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	thunderbird	From 154.0 (inc) to 156.0 (exc)
mozilla	firefox	to 153.3.0 (exc)
mozilla	firefox	From 154.0.0 (inc) to 156.0.0 (exc)
mozilla	thunderbird	to 153.3.0 (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: Notifications component of Firefox. It was fixed in Firefox version 156 and Firefox ESR version 153.3. The issue allows bypassing security measures in the notification system.

Detection Guidance

This vulnerability is specific to Firefox versions before 156, Firefox ESR before 153.3, and Thunderbird before 156. Detection involves checking installed versions of these applications. Use commands like 'firefox --version' or 'thunderbird --version' to verify versions. If versions are below the patched releases, the system is vulnerable.

Impact Analysis

The vulnerability could allow attackers to bypass security restrictions in the browser's notification system. This might lead to unauthorized notifications or potential phishing attempts if exploited.

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 Notifications component fixed in Firefox 156 and Thunderbird 156.

Mitigation Strategies

Update Firefox to version 156 or later and Firefox ESR to version 153.3 or later to address the vulnerability.

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