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Mozilla Firefox CVE-2026-16372

| EUVDEUVD-2026-46208 HIGH
Improper Privilege Management (CWE-269)
2026-07-21 mozilla GHSA-m5j7-35rx-phq8
Privilege Escalation Red Hat 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
8.3 HIGH

Browser sandbox-escape requires victim to load hostile content (UI:R) and non-trivial chaining (AC:H); success crosses the sandbox boundary (S:C) with full C/I/A impact.

3.1 AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
4.0 AV:N/AC:H/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: Content Processes component. This vulnerability was fixed in Firefox 153.

AnalysisAI

Privilege escalation in Mozilla Firefox's DOM Content Processes component allows attackers to escape or elevate beyond the sandboxed content process, gaining higher browser privileges on affected versions prior to Firefox 153. The flaw is a CWE-269 improper privilege management issue reported by Mozilla and patched in Firefox 153 (advisory MFSA2026-68). No public exploit has been identified and EPSS is low (0.14%, 4th percentile), indicating no observed exploitation activity at time of analysis despite the high CVSS 9.8 rating.

Technical ContextAI

Firefox uses a multi-process (Electrolysis/Fission) architecture in which untrusted web content is rendered inside sandboxed content processes that are meant to hold minimal privileges, while a more-privileged parent process brokers access to the file system, network, and OS. The affected 'DOM: Content Processes' component governs how these content processes manage and are granted capabilities. The root cause is classified as CWE-269 (Improper Privilege Management), meaning a content process can obtain privileges it should not hold - effectively weakening or defeating the content-process sandbox boundary. The single affected product per CPE is cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* (all versions before the 153 fix).

RemediationAI

Vendor-released patch: Firefox 153 - upgrade all Firefox installations to version 153 or later, which is the fix confirmed in Mozilla advisory MFSA2026-68 (https://www.mozilla.org/security/advisories/mfsa2026-68/). Because Firefox auto-updates by default, ensure the update channel is not disabled by enterprise policy and force a restart to apply the update. No specific vendor workaround is documented for this flaw; as compensating controls until patching completes, restrict browsing of untrusted sites, deploy the browser under OS-level sandboxing/application isolation, and consider tightening enterprise policies - noting these reduce but do not eliminate exposure and cannot substitute for the 153 upgrade. Consult Bugzilla 2013800 (https://bugzilla.mozilla.org/show_bug.cgi?id=2013800) for technical detail once unrestricted.

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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: Critical
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected

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CVE-2026-16372 vulnerability details – vuln.today
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