CVE-2026-92019

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Mitigation Bypass in Firefox Remote Settings Client

Publication date: 2026-09-15

Last updated on: 2026-09-21

Assigner: Mozilla Corporation

Description

Mitigation bypass in the Remote Settings Client component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16.

CVSS Scores

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Meta Information

Published

2026-09-15

Last Modified

2026-09-21

Generated

2026-10-05

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92019

EUVD

EUVD-2026-78482

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	156
mozilla	firefox_esr	115.41
mozilla	firefox_esr	140.16
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 Remote Settings Client component. It allows attackers to bypass security measures that were meant to protect against certain threats. The issue was patched in newer versions of Firefox and its ESR branches.

Detection Guidance

This CVE does not provide specific detection methods or commands for identifying the vulnerability on a network or system. The advisory only mentions that the issue was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.

Impact Analysis

If exploited, this vulnerability could allow unauthorized access or control over affected systems. Users running vulnerable Firefox versions might face data breaches, malware infections, or other security risks. Updating to patched versions mitigates this risk.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The description only mentions a mitigation bypass in the Remote Settings Client component without detailing potential compliance implications.

Mitigation Strategies

Update Firefox to version 156 or later, Firefox ESR to version 115.41 or later, Firefox ESR to version 140.16 or later, or Firefox ESR to version 153.3 or later to address the mitigation bypass in the Remote Settings Client component.

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