CVE-2026-92075

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Mitigation Bypass in Firefox Networking Component

Publication date: 2026-09-15

Last updated on: 2026-09-22

Assigner: Mozilla Corporation

Description

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

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-15

Last Modified

2026-09-22

Generated

2026-10-05

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92075

EUVD

EUVD-2026-78460

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	156
mozilla	firefox_esr	153.3

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 Firefox's Networking component. It allows attackers to bypass certain security measures that were meant to prevent specific types of attacks. The issue was addressed in Firefox version 156 and Firefox ESR version 153.3.

Detection Guidance

This vulnerability is a mitigation bypass in Firefox's Networking component, fixed in Firefox 156 and Firefox ESR 153.3. Detection requires checking installed Firefox versions. Run 'firefox --version' or 'firefox-esr --version' to compare against these versions. If versions are older, the system is vulnerable.

Impact Analysis

If exploited, this vulnerability could allow unauthorized access to network resources or sensitive data. Attackers might bypass security controls to perform actions like data exfiltration, remote code execution, or denial-of-service attacks. Users running vulnerable versions of Firefox are at risk.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR or HIPAA if it results in unauthorized data access or breaches. Organizations using affected Firefox versions may face penalties for failing to protect user data adequately. Immediate patching is recommended to maintain compliance.

Mitigation Strategies

Update Firefox to version 156 or later and Firefox ESR to version 153.3 or later to address the mitigation bypass in the Networking component.

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