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Mozilla Firefox CVE-2026-8969

| EUVDEUVD-2026-30921 HIGH
Protection Mechanism Failure (CWE-693)
2026-05-19 mozilla GHSA-2944-xfpq-698x
Authentication Bypass Mozilla
High
Disputed · 8.1 Vendor: mozilla
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Severity by source

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

Remote malicious page needs no privileges but requires the victim to open it (UI:R); mitigation bypass exposes and lets attacker alter protected data (C:H/I:H), with no availability effect.

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
HIGH
qualitative
Red Hat
3.4 LOW
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
None

Lifecycle Timeline

3
Analysis Generated
Jul 23, 2026 - 17:39 vuln.today
CVE Published
May 19, 2026 - 12:30 nvd
UNKNOWN (no severity yet)
CVE Published
May 19, 2026 - 12:30 cve.org
HIGH 8.1

DescriptionCVE.org

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151.

AnalysisAI

Protection-mechanism bypass in the DOM: Security component of Mozilla Firefox before version 151 lets a remote attacker circumvent a built-in security mitigation via a malicious web page, undermining a control designed to enforce web security boundaries. Exploitation requires the victim to interact with attacker-controlled content, and the flaw carries high confidentiality and integrity impact. No public exploit has been identified at time of analysis, and EPSS exploitation probability is very low (0.04%).

Technical ContextAI

The affected component is Firefox's DOM: Security subsystem, which enforces browser security primitives such as the same-origin policy, Content Security Policy, sandboxing, and other DOM-level protection boundaries. The issue is classified under CWE-693 (Protection Mechanism Failure), meaning an existing safeguard can be bypassed rather than a memory-corruption or injection primitive being triggered directly. The affected CPE is cpe:2.3:a:mozilla:firefox (all versions prior to the fix), and the practical effect is that a security mitigation intended to contain or restrict web content fails to hold, allowing content to reach a state or resource it should have been prevented from accessing.

RemediationAI

Vendor-released patch: Firefox 151 - upgrade all Firefox installations to version 151 or later, which contains the fix. Users on enterprise Linux distributions should apply the corresponding SUSE and Red Hat Firefox/Firefox ESR package updates as they become available through their normal errata channels. Refer to Mozilla advisories mfsa2026-46 (https://www.mozilla.org/security/advisories/mfsa2026-46/) and mfsa2026-50 (https://www.mozilla.org/security/advisories/mfsa2026-50/) for definitive fixed-version details. As a compensating control until patching completes, restrict browsing to trusted sites and enforce strict browser policies (e.g. blocking untrusted script execution or using an isolated browsing profile for high-risk activity); the trade-off is reduced functionality on sites that legitimately rely on the affected DOM security behavior, and these controls only reduce - not eliminate - the exposure since the flaw requires only that a user open a malicious page.

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Same weakness CWE-693 – Protection Mechanism Failure

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9.8
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8.1
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9.9
CVE-2025-40536 HIGH POC
8.1
CVE-2024-38217 MEDIUM POC
5.4
CVE-2026-21513 HIGH
8.8
CVE-2026-21510 HIGH POC
8.8

Same technique Authentication Bypass

View all
CVE-2023-22515 CRITICAL POC
9.8
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9.8
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CVE-2022-40684 CRITICAL POC
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CVE-2025-61882 CRITICAL POC
9.8
CVE-2024-0012 CRITICAL POC
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CVE-2023-46805 HIGH POC
8.2

Vendor StatusVendor

SUSE

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

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CVE-2026-8969 vulnerability details – vuln.today
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