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Mozilla Firefox CVE-2026-74965

| EUVDEUVD-2026-60663 HIGH
Improper Privilege Management (CWE-269)
2026-08-18 mozilla GHSA-c224-pmx6-qhpm
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 browser exploit requiring only user interaction; no auth needed; full CIA impact within unchanged Firefox privilege scope per CWE-269.

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
6.1 MEDIUM
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 - 16:33 vuln.today
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)
CVE Published
Aug 18, 2026 - 12:23 cve.org
HIGH 8.8

DescriptionCVE.org

Privilege escalation in the Shell Integration 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 via the Shell Integration component in Mozilla Firefox allows a remote unauthenticated attacker - with user interaction - to achieve full compromise of confidentiality, integrity, and availability on affected systems. Affected are all Firefox releases prior to 154 and ESR branches prior to 140.14 and 153.1, as confirmed by Mozilla advisories mfsa2026-74, mfsa2026-76, and mfsa2026-77. No public exploit or CISA KEV listing has been identified at time of analysis, and SSVC rates exploitation status as none.

Technical ContextAI

The affected product is Mozilla Firefox across all versions (CPE: cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*). The Shell Integration component mediates interactions between the Firefox browser and the underlying operating system shell - encompassing protocol handler registration, file association handling, and OS-level invocation pathways. The root cause is CWE-269 (Improper Privilege Management), meaning the component fails to correctly validate or restrict privilege transitions when handling shell-level operations. This class of flaw typically arises when a privileged execution context is reachable through an insufficiently guarded code path, allowing an attacker-controlled input to trigger actions at a privilege level higher than intended. The vulnerability is network-reachable through the browser's normal content-processing pipeline, consistent with AV:N in the CVSS vector.

RemediationAI

Vendor-released patch: Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1. Upgrade to one of these versions immediately using your organization's standard browser management tooling or via Mozilla's auto-update mechanism. Vendor advisories are published at https://www.mozilla.org/security/advisories/mfsa2026-74/, https://www.mozilla.org/security/advisories/mfsa2026-77/, and https://www.mozilla.org/security/advisories/mfsa2026-76/. For environments where immediate patching is not feasible, consider restricting Firefox Shell Integration features via enterprise policy (e.g., using Firefox's managed policies JSON to disable external protocol handler invocations), which reduces the attack surface at the cost of legitimate OS-integration functionality. Additionally, endpoint privilege management tools that enforce least-privilege for browser processes can limit the practical impact of escalation attempts, though these are compensating controls and not substitutes for the patch.

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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-2026-74965 vulnerability details – vuln.today
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