Skip to main content

Mozilla Firefox EUVDEUVD-2026-60749

| CVE-2026-74942 HIGH
Improper Privilege Management (CWE-269)
2026-08-18 mozilla GHSA-f6x3-5q9f-gph4
Privilege Escalation Red Hat Mozilla Suse
8.8
CVSS 3.1 · Vendor: mozilla
Share

Severity by source

Vendor (mozilla) PRIMARY
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vuln.today AI
8.8 HIGH

Network vector with no attacker authentication required; user interaction is the sole prerequisite; privilege escalation yields total CIA impact within the unchanged browser scope.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Aug 18, 2026 - 16:56 vuln.today
CVE Published
Aug 18, 2026 - 12:23 cve.org
HIGH 8.8
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

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

Articles & Coverage 1

News 12 New Mozilla Vulnerabilities - 12 High Severity, No POC Available Aug 18, 2026

AnalysisAI

Privilege escalation via the Remote Settings Client component affects Mozilla Firefox across all supported mainline and ESR release tracks, with Mozilla assigning the issue CVSS 8.8 High severity. The flaw (CWE-269, Improper Privilege Management) permits a network-based attacker to escalate privileges within the browser context when a user interacts with attacker-controlled content, achieving total confidentiality, integrity, and availability impact. No public exploit code exists and CISA has not listed this in KEV, but the simultaneous patching of three ESR branches alongside mainline signals that Mozilla assessed significant breadth of exposure across its install base.

Technical ContextAI

The Remote Settings Client is a default Firefox internal component that fetches configuration data, feature flags, and policy updates from Mozilla's remote infrastructure. CWE-269 (Improper Privilege Management) identifies the root cause class as a failure to correctly constrain or validate privilege levels during this client's data-processing operations - a pattern where remotely sourced content is handled with elevated trust or permissions it should not carry. The affected CPE (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) covers the entire Firefox product line without a documented lower-bound version, implying the vulnerable code path has been present across an extended version history. The fact that fixes were issued simultaneously across three distinct ESR major versions (115.x, 140.x, 153.x) and the mainline 154 release confirms the flaw resides in shared code inherited across branches.

RemediationAI

Upgrade to Firefox 154 (mainline) or the applicable ESR fixed version: Firefox ESR 115.39, Firefox ESR 140.14, or Firefox ESR 153.1, as confirmed by Mozilla's MFSA advisories mfsa2026-74 through mfsa2026-77 at https://www.mozilla.org/security/advisories/. Enterprise deployments locked to a specific ESR major version should identify and apply the corresponding ESR fix rather than jumping tracks. If immediate patching is operationally blocked, restricting end-user access to untrusted or external web content through network-layer controls or browser group policy (e.g., disabling arbitrary web navigation) reduces attacker opportunity to reach the Remote Settings Client code path, though this significantly impairs general browsing capability. Mozilla has not disclosed a configuration-level toggle to disable the Remote Settings Client independently, so patching is the only fully effective remediation.

More in Mozilla

View all
CVE-2015-4495 HIGH POC
8.8 Aug 08

The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote
CVE-2013-1690 HIGH POC
8.8 Jun 26

Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before

CVE-2013-0758 CRITICAL POC
9.3 Jan 13

Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderb
CVE-2013-0753 CRITICAL POC
9.3 Jan 13

Use-after-free vulnerability in the serializeToStream implementation in the XMLSerializer component in Mozilla Firefox b
CVE-2012-3993 CRITICAL POC
9.3 Oct 10

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbi
CVE-2013-1710 CRITICAL POC
10.0 Aug 07

The crypto.generateCRMFRequest function in Mozilla Firefox before 23.0, Firefox ESR 17.x before 17.0.8, Thunderbird befo
CVE-2017-3823 HIGH POC
8.8 Feb 01

An issue was discovered in the Cisco WebEx Extension before 1.0.7 on Google Chrome, the ActiveTouch General Plugin Conta
CVE-2014-8636 HIGH POC
7.5 Jan 14

The XrayWrapper implementation in Mozilla Firefox before 35.0 and SeaMonkey before 2.32 does not properly interact with

CVE-2013-0757 CRITICAL POC
9.3 Jan 13

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbi
CVE-2014-1510 CRITICAL POC
9.8 Mar 19

The Web IDL implementation in Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and Se
CVE-2014-1511 CRITICAL POC
9.8 Mar 19

Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allow remo
CVE-2013-0643 HIGH
8.8 Feb 27

The Firefox sandbox in Adobe Flash Player before 10.3.183.67 and 11.x before 11.6.602.171 on Windows and Mac OS X, and b

Same weakness CWE-269 – Improper Privilege Management

View all
CVE-2017-5689 CRITICAL POC
9.8
CVE-2021-20021 CRITICAL POC
9.8
CVE-2017-12635 CRITICAL POC
9.8
CVE-2012-3993 CRITICAL POC
9.3
CVE-2017-11467 CRITICAL POC
9.8
CVE-2014-1510 CRITICAL POC
9.8
CVE-2014-1511 CRITICAL POC
9.8
CVE-2019-1405 HIGH POC
7.8

Same technique Privilege Escalation

View all
CVE-2024-0012 CRITICAL POC
9.3
CVE-2025-47812 CRITICAL POC
10.0
CVE-2013-0422 CRITICAL POC
9.8
CVE-2013-0632 CRITICAL POC
9.8
CVE-2024-9474 MEDIUM POC
6.9
CVE-2017-5689 CRITICAL POC
9.8
CVE-2021-20021 CRITICAL POC
9.8
CVE-2017-12635 CRITICAL POC
9.8

Vendor StatusVendor

SUSE

Severity: Important
Product Status
Container suse/kiosk/firefox-esr:140.14-75.12 Affected
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Desktop Applications 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed

Share

EUVD-2026-60749 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy