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Mozilla Firefox CVE-2026-12316

| EUVDEUVD-2026-37107 CRITICAL
Protection Mechanism Failure (CWE-693)
2026-06-16 mozilla GHSA-cw62-w555-56pp
Authentication Bypass Mozilla Suse Red Hat
Critical
Disputed · 9.1 Vendor: mozilla
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Severity by source

Sources disagree (Medium–Critical)
Vendor (mozilla) PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
8.1 HIGH

Network-reachable web content bypass with no privileges; UI:R because the victim must load attacker-controlled content in Firefox; high C/I from cross-origin data exposure, no availability impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

3
Analysis Generated
Jun 16, 2026 - 20:22 vuln.today
CVSS changed
Jun 16, 2026 - 20:22 NVD
9.1 (CRITICAL)
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152.

Articles & Coverage 1

News Critical Security Mitigation Bypass in Mozilla Firefox - CVE-2026-12316 Jun 17, 2026

AnalysisAI

Security mitigation bypass in the DOM: Security component of Mozilla Firefox prior to version 152 allows remote attackers to compromise confidentiality and integrity of browser-rendered content without user interaction. The flaw carries a critical CVSS 3.1 score of 9.1 (AV:N/AC:L/PR:N/UI:N) and is tagged as an Authentication Bypass class issue, though no public exploit identified at time of analysis. The vulnerability has been patched by Mozilla in Firefox 152 per MFSA2026-57/MFSA2026-60.

Technical ContextAI

The vulnerability resides in Firefox's DOM: Security component, which enforces web security boundaries including Same-Origin Policy, Content Security Policy (CSP), and other DOM-level protections. The root cause is classified as CWE-693 (Protection Mechanism Failure), meaning an intended security mitigation can be bypassed rather than a memory corruption or injection flaw. CPE data confirms the affected product is Mozilla Firefox (cpe:2.3:a:mozilla:firefox:*), and given the DOM: Security subsystem is shared, derivative products such as Firefox ESR and Thunderbird may also be impacted, though only Firefox is named in the CPE.

RemediationAI

Vendor-released patch: Firefox 152 - upgrade Firefox to version 152 or later as published in Mozilla advisories MFSA2026-57 (https://www.mozilla.org/security/advisories/mfsa2026-57/) and MFSA2026-60 (https://www.mozilla.org/security/advisories/mfsa2026-60/). For enterprise deployments, push the update via Group Policy, MDM, or the Mozilla AutoConfig channel to ensure rapid rollout. As no specific workaround was published, compensating controls until patching is complete include restricting browsing to trusted sites via enterprise web filtering, enforcing strict CSP at the proxy/WAF layer for sensitive web applications, and disabling browser auto-launch from untrusted file types - these reduce attack surface but do not close the underlying DOM: Security gap and will inconvenience users who rely on broad web access. Verify ESR users via the Bugzilla entry at https://bugzilla.mozilla.org/show_bug.cgi?id=2045496 to determine whether a parallel ESR fix is required.

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Same weakness CWE-693 – Protection Mechanism Failure

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9.8
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5.3
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Same technique Authentication Bypass

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9.3
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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
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

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CVE-2026-12316 vulnerability details – vuln.today
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