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Mozilla Firefox EUVDEUVD-2026-46207

| CVE-2026-16371 HIGH
Improper Privilege Management (CWE-269)
2026-07-21 mozilla GHSA-8rfc-phx9-6vc2
Privilege Escalation Mozilla
High
Disputed · 8.8 Vendor: mozilla
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Severity by source

Sources disagree (Medium–Critical)
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
9.6 CRITICAL

Browser navigation flaws require the victim to load attacker content (UI:R) and privilege escalation escaping the content sandbox constitutes a scope change (S:C); impact is high across C/I/A.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/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:H/SI:H/SA:H
SUSE
CRITICAL
qualitative
Red Hat
6.1 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

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

7
Re-analysis Queued
Jul 24, 2026 - 21:22 vuln.today
cvss_changed
Severity Changed
Jul 24, 2026 - 21:22 NVD
CRITICAL HIGH
CVSS changed
Jul 24, 2026 - 21:22 NVD
9.8 (CRITICAL) 8.8 (HIGH)
Analysis Generated
Jul 22, 2026 - 17:08 vuln.today
CVSS changed
Jul 22, 2026 - 16:22 NVD
9.8 (CRITICAL)
CVE Published
Jul 21, 2026 - 12:37 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:37 cve.org
CRITICAL 9.8

DescriptionCVE.org

Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.

AnalysisAI

Privilege escalation in Mozilla Firefox's DOM Navigation component allows remote attackers to elevate privileges, and given the CVSS network vector (AV:N/PR:N/UI:N) an attacker could compromise confidentiality, integrity, and availability without authentication or user interaction. The flaw affects Firefox before version 153 and Firefox ESR before 140.13, and was fixed by Mozilla in those releases. No public exploit identified at time of analysis, and EPSS exploitation probability is low (0.15%, 5th percentile).

Technical ContextAI

The vulnerability resides in the DOM Navigation component of Gecko, Firefox's browser engine, which governs how documents transition between browsing contexts (loading URLs, history traversal, and cross-origin navigations). The root cause class is CWE-269 (Improper Privilege Management), meaning the component fails to correctly assign, enforce, or drop the privilege boundary associated with a navigation, potentially allowing web content to gain privileges it should not hold (e.g., escaping the content sandbox or crossing an origin/principal boundary). The affected product per CPE is cpe:2.3:a:mozilla:firefox (all versions prior to the fix), and the same engine underlies the ESR channel used in enterprise and Linux distribution deployments.

RemediationAI

Vendor-released patch: upgrade to Firefox 153 or Firefox ESR 140.13, which contain the fix. Standard-channel users should update to Firefox 153 (or later) and enterprise/LTS deployments should move to ESR 140.13 (or later); verify deployment via the Mozilla advisories at https://www.mozilla.org/security/advisories/mfsa2026-68/ and https://www.mozilla.org/security/advisories/mfsa2026-70/. Because Firefox auto-updates by default, ensure automatic updates are enabled and not blocked by managed policy; where immediate patching is not possible, compensating controls include restricting browsing to trusted sites, deploying network/proxy-level web filtering to reduce exposure to untrusted content, and enforcing site isolation - though these reduce rather than eliminate risk and may impair usability, so patching remains the only complete remedy.

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected

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EUVD-2026-46207 vulnerability details – vuln.today
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