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Mozilla Firefox CVE-2026-6765

| EUVDEUVD-2026-24106 MEDIUM
Exposure of Private Personal Information to an Unauthorized Actor (CWE-359)
2026-04-21 mozilla GHSA-v5vh-6mhh-h6gc
Information Disclosure Mozilla
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
vuln.today AI
4.3 MEDIUM

UI:R reflects that Form Autofill exploitation practically requires the victim's browser to be in an autofill-active form context; all other metrics follow the vendor CVSS.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

5
Analysis Generated
Jul 24, 2026 - 07:10 vuln.today
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
CVSS changed
Apr 21, 2026 - 21:22 NVD
5.3 (None) 5.3 (MEDIUM)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24106
CVE Published
Apr 21, 2026 - 12:40 nvd
MEDIUM 5.3

DescriptionCVE.org

Information disclosure in the Form Autofill component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.

AnalysisAI

Information disclosure via the Form Autofill component in Mozilla Firefox exposes private user data to unauthorized parties through a network-accessible vector requiring no privileges. All Firefox versions prior to 150 and Firefox ESR versions prior to 140.10 are affected. With an EPSS of 0.03% and SSVC exploitation status of none, real-world exploitation appears limited at this time, though the low-friction CVSS vector and widespread browser deployment make patching advisable.

Technical ContextAI

CWE-359 (Exposure of Private Personal Information to an Unauthorized Actor) describes the root cause: the Form Autofill subsystem - the browser feature that stores and replays user-entered data such as names, addresses, and payment details - leaks private information in a way that could be accessed by an unauthorized context, such as a malicious web page. The affected component is Mozilla Firefox (CPE: cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*), covering all platform variants. The bug is tracked internally at bugzilla.mozilla.org/show_bug.cgi?id=2022419 and addressed across four Mozilla advisories (mfsa2026-30, mfsa2026-32, mfsa2026-33, mfsa2026-34), suggesting the fix may touch multiple code paths or release trains.

RemediationAI

Upgrade Mozilla Firefox to version 150 or later, or Firefox ESR to version 140.10 or later - these versions contain the vendor-confirmed fix per Mozilla advisories at https://www.mozilla.org/security/advisories/mfsa2026-30/, mfsa2026-32, mfsa2026-33, and mfsa2026-34. Red Hat users should apply RHSA-2026:10767, RHSA-2026:10766, or RHSA-2026:10757 as appropriate for their RHEL version. SUSE users should apply the corresponding SUSE security update when available. If immediate upgrade is not possible, a targeted workaround is to disable the Form Autofill feature in Firefox via about:config by setting extensions.formautofill.addresses.enabled and extensions.formautofill.creditCards.enabled to false - this removes the vulnerable component entirely at the cost of losing autofill convenience. No other confirmed compensating controls are documented in the available references.

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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-2026-6765 vulnerability details – vuln.today
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