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Mozilla Firefox CVE-2026-6770

| EUVDEUVD-2026-24111 MEDIUM
Information Exposure (CWE-200)
2026-04-21 mozilla GHSA-rx3r-9q8p-8rrj
Information Disclosure Mozilla Red Hat Suse
6.5
CVSS 3.1 · NVD
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Severity by source

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

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
6.5 (MEDIUM)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24111
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:41 nvd
MEDIUM 6.5

DescriptionCVE.org

Other issue in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.

AnalysisAI

Information disclosure in Firefox's IndexedDB storage component allows remote unauthenticated attackers to leak sensitive data through a network-accessible vulnerability with no user interaction required. Affected versions include Firefox prior to 150 and Firefox ESR prior to 140.10. The vulnerability has a CVSS score of 6.5 reflecting moderate severity with confidentiality impact and limited availability risk.

Technical ContextAI

Mozilla Firefox implements IndexedDB as a client-side storage mechanism for web applications, governed by the W3C specification. The vulnerability resides in the IndexedDB component's handling of storage access, classified under CWE-200 (Information Exposure). The flaw allows unauthorized access or disclosure of data that should be protected, potentially affecting any web application relying on IndexedDB for sensitive client-side storage. The attack vector is network-based with low complexity and requires no privileges or user interaction, suggesting the vulnerability may be exploitable through a crafted web request or malicious website.

RemediationAI

Users should immediately update to Firefox 150 or later, or Firefox ESR 140.10 or later, both of which contain the upstream fix. Firefox users can enable automatic updates through the browser preferences menu (Settings > General > Firefox Updates) to receive patches automatically. Organizations managing Firefox deployments should use configuration management to enforce upgrades to patched versions. For users unable to immediately patch, disabling IndexedDB functionality at the browser policy level (via policies.json on Windows or through mobile device management on other platforms) provides a temporary compensating control, though this may break legitimate web applications that depend on IndexedDB for offline functionality and data persistence. Mozilla's security advisory (MFSA2026-30 and MFSA2026-32) provides additional guidance and confirmation of fix versions.

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Same weakness CWE-200 – Information Exposure

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0 Fixed
openSUSE Leap 16.0 Fixed

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CVE-2026-6770 vulnerability details – vuln.today
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