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Mozilla Firefox EUVDEUVD-2026-60746

| CVE-2026-74939 HIGH
Improper Privilege Management (CWE-269)
2026-08-18 mozilla GHSA-mcwh-jxcv-xq9h
Privilege Escalation Mozilla
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 webpage visit with UI:R for page navigation; S:U as privilege escalation stays within Firefox process, not OS; PR:N confirmed by lack of any authentication precondition.

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

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 - 16:29 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: Navigation 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 Navigation component allows a remote unauthenticated attacker to achieve full confidentiality, integrity, and availability compromise within the browser process by inducing a user to visit a malicious webpage. All Firefox releases prior to version 154 and all active ESR branches (115.x, 140.x, 153.x) are affected, with Mozilla issuing four simultaneous MFSA advisories (mfsa2026-74 through mfsa2026-77) indicating broad impact across every supported release channel. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker hosts crafted webpage with malicious navigation payload
Delivery
Target Firefox user visits page via phishing or malvertising
Exploit
Malicious DOM navigation event triggers CWE-269 privilege mismanagement
Execution
Browser escalates attacker context to elevated internal privileges
Impact
Full confidentiality, integrity, and availability compromise of browser process achieved
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Vulnerability AssessmentAI

Exploitation The sole prerequisite for exploitation is that the victim uses an unpatched Firefox version and visits an attacker-controlled webpage - the CVSS UI:R metric confirms this passive user interaction is required. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 8.8 (High) vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H signals a highly accessible attack: network-reachable, low complexity, no authentication, requiring only passive user interaction (visiting a webpage). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker registers or compromises a website and embeds JavaScript or navigation logic crafted to trigger improper privilege handling in the DOM Navigation component. When a target Firefox user visits the page - the sole required interaction - the malicious navigation event exploits CWE-269 to escalate from web content privileges to elevated browser-internal privileges, granting the attacker full read/write access to browser state, stored credentials, session cookies, and any data accessible within the browser process. …
Remediation The primary remediation is to upgrade Firefox immediately: standard release users should update to Firefox 154 or later; ESR 115.x users to Firefox ESR 115.39; ESR 140.x users to Firefox ESR 140.14; ESR 153.x users to Firefox ESR 153.1. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, notify all Firefox users of the vulnerability and implement temporary restrictions on Firefox usage for sensitive activities; disable Firefox plug-ins that are not essential and enable sandboxing features if available. …

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EUVD-2026-60746 vulnerability details – vuln.today
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