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Red Hat EUVDEUVD-2026-46220

| CVE-2026-16383 CRITICAL
Protection Mechanism Failure (CWE-693)
2026-07-21 mozilla GHSA-jv2w-p5jv-grr5
Authentication Bypass Red Hat Mozilla
Critical
Disputed · 9.8 Vendor: mozilla
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Severity by source

Sources disagree (Medium–Critical)
Vendor (mozilla) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A: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
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Jul 22, 2026 - 21:12 vuln.today
CVSS changed
Jul 22, 2026 - 19:22 NVD
9.8 (CRITICAL)
CVE Published
Jul 21, 2026 - 12:37 cve.org
CRITICAL 9.8
CVE Published
Jul 21, 2026 - 12:37 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Mitigation bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.

AnalysisAI

Security-mitigation bypass in Mozilla Firefox's DOM: Networking component undermines a built-in protection mechanism (CWE-693), potentially allowing crafted web content to defeat network-layer defenses in versions prior to Firefox 153 and ESR 140.13. The issue was reported and patched by Mozilla with no public exploit identified at time of analysis; EPSS is very low (0.16%, 6th percentile) and it is not listed in CISA KEV. The NVD-assigned CVSS of 9.8 (network, no auth, no user interaction) sits in tension with the sparse 'mitigation bypass' description, which typically describes a defense-defeating enabler rather than direct code execution.

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Same weakness CWE-693 – Protection Mechanism Failure

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Same technique Authentication Bypass

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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-2026-46220 vulnerability details – vuln.today
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