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Mozilla Firefox CVE-2026-6779

| EUVDEUVD-2026-24120 MEDIUM
Improper Input Validation (CWE-20)
2026-04-21 mozilla GHSA-xp4p-9mc9-5c47
Information Disclosure Mozilla Red Hat Suse
5.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

6
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Generated
Apr 21, 2026 - 18:25 vuln.today
CVSS changed
Apr 21, 2026 - 18:22 NVD
5.3 (MEDIUM)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24120
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:41 nvd
MEDIUM 5.3

DescriptionCVE.org

Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.

AnalysisAI

Mozilla Firefox JavaScript Engine contains an improper input validation flaw that permits remote, unauthenticated information disclosure to attackers without user interaction. The vulnerability (CWE-20: Improper Input Validation) affects all versions prior to Firefox 150 and allows attackers to access sensitive data via a network-based attack with low complexity. A vendor-released patch is available in Firefox 150.

Technical ContextAI

The vulnerability resides in Firefox's JavaScript Engine component, a core interpreter responsible for executing JavaScript code in web pages. CWE-20 (Improper Input Validation) indicates the engine fails to properly validate or sanitize untrusted input before processing, likely in the parsing, compilation, or execution phases. This class of defect commonly leads to memory safety issues, type confusion, or logic errors that bypass security boundaries. The affected product spans all Firefox versions across all platforms (as indicated by the CPE wildcard), suggesting the flaw is in shared engine code rather than platform-specific logic.

RemediationAI

Install Firefox 150 or later to obtain the vendor-released patch. Users should enable automatic updates in Firefox preferences (Settings → General → Updates) to receive security patches immediately upon release. Organizations managing Firefox deployments can download Firefox 150 from mozilla.org/firefox/new or deploy via package managers (apt, yum, chocolatey, etc.). No workarounds are available for unpatched versions; the only mitigation is to upgrade. Note that disabling JavaScript entirely would prevent exploitation but is not practical for modern web usage and is not a recommended compensating control.

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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-2026-6779 vulnerability details – vuln.today
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