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Mozilla CVE-2026-4712

| EUVDEUVD-2026-14839 HIGH
Information Exposure (CWE-200)
2026-03-24 mozilla GHSA-vcpc-fv28-ppg5
Mozilla Information Disclosure Red Hat Suse
7.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SUSE
HIGH
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 24, 2026 - 12:45 euvd
EUVD-2026-14839
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
HIGH 7.5

DescriptionCVE.org

Information disclosure in the Widget: Cocoa component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9.

AnalysisAI

An information disclosure vulnerability exists in the Widget: Cocoa component of Mozilla Firefox and Firefox ESR, allowing attackers to access sensitive information through the affected rendering engine. Firefox versions prior to 149 and Firefox ESR versions prior to 140.9 are vulnerable. The vulnerability permits unauthorized information leakage, though the specific attack mechanism and data exposure scope require analysis of the referenced Mozilla security advisories.

Technical ContextAI

The vulnerability resides in the Widget: Cocoa component, which is the native macOS widget abstraction layer in Firefox responsible for rendering graphical user interface elements and managing system-level interactions on Apple's Cocoa framework. The Cocoa widget backend provides critical bindings between Firefox's cross-platform UI code and native macOS APIs. This vulnerability represents an information disclosure weakness (CWE category unspecified in available data) within this native integration layer, suggesting improper handling of sensitive data during widget rendering, event processing, or system resource interaction on macOS systems. Affected products include Mozilla Firefox (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) and Firefox ESR (cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*) across all architectures and configurations prior to specified patch versions.

RemediationAI

Users must upgrade Firefox to version 149 or later immediately, and Firefox ESR users must upgrade to version 140.9 or later. Visit https://www.mozilla.org/security/advisories/mfsa2026-20/ and https://www.mozilla.org/security/advisories/mfsa2026-22/ for detailed advisory information and download links. For organizations unable to immediately patch, implement network segmentation to restrict Firefox's access to sensitive resources, disable browser-based access to high-value systems until patching is complete, and consider temporary deployment of alternative browsers for critical tasks. Enable automatic Firefox updates if not already configured to ensure rapid deployment of patch versions once upgraded, and monitor systems for any evidence of exploitation related to Cocoa widget information disclosure as noted in the Mozilla security advisories.

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Same weakness CWE-200 – Information Exposure

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Vendor StatusVendor

Debian

firefox
Release Status Fixed Version Urgency
sid vulnerable 148.0.2-1 -
(unstable) fixed (unfixed) -
firefox-esr
Release Status Fixed Version Urgency
bullseye vulnerable 115.14.0esr-1~deb11u1 -
bullseye (security) vulnerable 140.8.0esr-1~deb11u1 -
bookworm vulnerable 128.14.0esr-1~deb12u1 -
bookworm (security) vulnerable 140.8.0esr-1~deb12u1 -
trixie (security), trixie vulnerable 140.8.0esr-1~deb13u1 -
forky, sid vulnerable 140.8.0esr-1 -
(unstable) fixed (unfixed) -

SUSE

Severity: High
Product Status
Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Affected
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed

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CVE-2026-4712 vulnerability details – vuln.today
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