CVE-2026-74942

Analyzed Analyzed - Analysis Complete

Privilege Escalation in Firefox Remote Settings Client

Publication date: 2026-08-18

Last updated on: 2026-08-21

Assigner: Mozilla Corporation

Description

Privilege escalation in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

CVSS Scores

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Meta Information

Published

2026-08-18

Last Modified

2026-08-21

Generated

2026-09-08

AI Q&A

2026-08-18

EPSS Evaluated

2026-09-07

NVD

CVE-2026-74942

EUVD

EUVD-2026-60749

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 115.39.0 (exc)
mozilla	firefox	From 116.0 (inc) to 140.14.0 (exc)
mozilla	firefox	From 141.0 (inc) to 153.1.0 (exc)
mozilla	thunderbird	From 141.0 (inc) to 153.1.0 (exc)
mozilla	thunderbird	to 140.14.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-269	The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

Attack-Flow Graph

Executive Summary

This is a privilege escalation vulnerability in Firefox's Remote Settings Client component. It allows an attacker to gain higher access levels than intended, potentially taking control of affected systems.

Detection Guidance

This vulnerability is specific to Firefox versions before 154, Firefox ESR 115.39, 140.14, and 153.1. Detection involves checking installed Firefox versions. Use commands like 'firefox --version' or 'apt list --installed | grep firefox' on Linux. Compare versions against the fixed releases.

Impact Analysis

If exploited, this flaw could let attackers bypass security restrictions, install malware, steal data, or perform unauthorized actions on your system. Users of vulnerable Firefox versions are at risk.

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 privilege escalation issue in Firefox's Remote Settings Client component.

Mitigation Strategies

Update Firefox to version 154 or later, Firefox ESR to version 115.39 or later, Firefox ESR to version 140.14 or later, or Firefox ESR to version 153.1 or later to address the privilege escalation in the Remote Settings Client component.

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