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Mozilla Firefox CVE-2026-74941

| EUVDEUVD-2026-60748 HIGH
Improper Privilege Management (CWE-269)
2026-08-18 mozilla GHSA-5gpv-5wvw-2f9q
Privilege Escalation Red Hat Mozilla Suse
8.8
CVSS 3.1 · Vendor: mozilla
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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-delivered via web page (AV:N, PR:N), single user visit required (UI:R, AC:L); unchanged scope since impact remains within browser process; full CIA loss from privilege escalation in rendering subsystem.

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:P/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 - 16:57 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 Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, 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 in Firefox's CanvasWebGL graphics component affects all Firefox releases prior to version 154 and both active ESR branches, enabling a remote attacker to gain full control over confidentiality, integrity, and availability within the browser process. The flaw stems from improper privilege management (CWE-269) in the WebGL canvas rendering pipeline, exploitable by luring a victim to a crafted web page - no authentication or special software is required beyond a standard Firefox installation. No public exploit code or active exploitation has been identified at time of analysis; however, Mozilla issued three simultaneous security advisories (MFSA2026-74/76/77) addressing all supported release tracks, signaling broad internal severity.

Technical ContextAI

WebGL (Web Graphics Library) is a browser-native JavaScript API allowing GPU-accelerated 2D and 3D rendering within HTML canvas elements, implemented in Firefox's Graphics: CanvasWebGL subsystem. The root cause class is CWE-269 (Improper Privilege Management), indicating that the WebGL rendering context fails to correctly enforce privilege boundaries during canvas operations - potentially allowing code executing in a renderer process to access or influence resources it should not be permitted to. The affected product is comprehensively identified by CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, covering all platforms, architectures, and build variants. The issue is tracked at Mozilla Bugzilla bug #2055056 and resolved across the standard release channel and two ESR branches, each addressed by a dedicated MFSA advisory.

RemediationAI

Vendor-released patches are available: upgrade to Firefox 154 or later, Firefox ESR 140.14 or later, or Firefox ESR 153.1 or later, per Mozilla Security Advisories MFSA2026-74, MFSA2026-76, and MFSA2026-77 at https://www.mozilla.org/security/advisories/mfsa2026-74/. Where immediate patching is not feasible, WebGL can be disabled via about:config by setting webgl.disabled to true - this eliminates the CanvasWebGL attack surface entirely but will break WebGL-dependent web applications and may impact productivity for users relying on browser-based 3D or graphics-heavy tools. Alternatively, browser isolation solutions (e.g., remote browser isolation platforms) can neutralize drive-by exploit delivery without requiring local configuration changes. Enterprise deployment via policy (mozilla.cfg or Group Policy) can enforce the WebGL disable at scale.

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Same weakness CWE-269 – Improper Privilege Management

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Same technique Privilege Escalation

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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

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CVE-2026-74941 vulnerability details – vuln.today
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