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Mozilla Firefox CVE-2026-6774

| EUVDEUVD-2026-24115 MEDIUM
Protection Mechanism Failure (CWE-693)
2026-04-21 mozilla GHSA-gp6f-8rr3-wxrg
Authentication Bypass Mozilla Red Hat Suse
5.4
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.4 MEDIUM
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
SUSE
MEDIUM
qualitative
Red Hat
3.4 LOW
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

6
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Generated
Apr 21, 2026 - 16:31 vuln.today
CVSS changed
Apr 21, 2026 - 15:22 NVD
5.4 (MEDIUM)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24115
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:41 nvd
MEDIUM 5.4

DescriptionCVE.org

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150.

AnalysisAI

Mitigation bypass in Firefox's DOM Security component allows authenticated remote attackers with user interaction to circumvent security controls and gain limited read/write access to sensitive data across security boundaries. Firefox 150 and later versions contain the fix; versions prior to 150 are vulnerable. SSVC assessment indicates no current public exploitation, though the vulnerability requires user interaction and authentication to trigger.

Technical ContextAI

This vulnerability exploits a flaw in Firefox's DOM (Document Object Model) Security implementation, classified under CWE-693 (Protection Mechanism Failure), which indicates a breakdown in access control or security policy enforcement at the DOM level. The CVE targets the browser's sandbox or cross-origin security model, allowing partial bypass of Same-Origin Policy or related protections. CPE data confirms all Firefox versions prior to 150 are affected; the network-based attack vector suggests the vulnerability can be triggered via specially crafted web content that the user must interact with, combined with attacker authentication context.

RemediationAI

Update Firefox to version 150 or later immediately via the built-in auto-update mechanism or manual download from mozilla.org/firefox. Firefox will typically prompt users to restart the browser after downloading an update; users should not delay this restart. No workarounds are available for unpatched versions since the vulnerability affects core DOM security logic. Organizations managing Firefox via group policy or enterprise deployment should push Firefox 150+ to all endpoints. If immediate patching is not possible, consider restricting user access to untrusted websites or enforcing strict browser sandboxing at the OS level, though these are temporary mitigations only. Refer to Mozilla Security Advisory MFSA2026-30 for version-specific details and verification steps.

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Same weakness CWE-693 – Protection Mechanism Failure

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
openSUSE Tumbleweed Fixed
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

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CVE-2026-6774 vulnerability details – vuln.today
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