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Mozilla Firefox EUVDEUVD-2026-60744

| CVE-2026-74935 HIGH
Improper Privilege Management (CWE-269)
2026-08-18 mozilla GHSA-8r77-hpjc-9jv5
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 content, no privileges or special conditions required, but user must visit attacker page; privilege escalation stays within browser process boundary (S:U).

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
7.5 HIGH
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
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

4
Analysis Generated
Aug 18, 2026 - 16:28 vuln.today
CVSS changed
Aug 18, 2026 - 16:22 NVD
8.8 (HIGH)
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 DOM: Networking 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 in Firefox's DOM Networking component allows remote attackers who can lure a user to a malicious webpage to achieve high-impact compromise of confidentiality, integrity, and availability. The flaw, rooted in improper privilege management (CWE-269), affects all Firefox releases prior to version 154 and multiple ESR branches, and has been patched across four simultaneous Mozilla advisories (mfsa2026-74 through mfsa2026-77). No public exploit code has been identified at time of analysis, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Technical ContextAI

The affected component is Firefox's DOM Networking layer - the subsystem responsible for handling network requests initiated by web content (e.g., fetch, XMLHttpRequest, resource loading). CWE-269 (Improper Privilege Management) indicates that this component fails to correctly enforce privilege boundaries, potentially allowing web content executing in a lower-privilege context to obtain capabilities or access associated with a higher-privilege browser process or network operation. The CPE string cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* confirms all Firefox application variants are affected. The simultaneous ESR advisory set (115.39, 140.14, 153.1, and 154) indicates the flaw exists across a broad range of Firefox codebases maintained in parallel, suggesting a long-lived or structural deficiency in privilege handling within the networking subsystem.

RemediationAI

Vendor-released patches are available: upgrade to Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, or Firefox ESR 153.1 as appropriate for the deployed branch. Organizations using enterprise ESR channels should consult the applicable advisory (mfsa2026-74 through mfsa2026-77) at https://www.mozilla.org/security/advisories/ to confirm the correct target version. If immediate patching is not possible, compensating controls include restricting access to untrusted or external web content via proxy filtering or browser isolation solutions (e.g., remote browser isolation), and disabling scripted network access features where policy permits. These controls reduce exposure but do not eliminate the vulnerability; patching is the definitive fix.

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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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EUVD-2026-60744 vulnerability details – vuln.today
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