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Mozilla Firefox CVE-2026-12320

| EUVDEUVD-2026-37111 MEDIUM
Information Exposure (CWE-200)
2026-06-16 mozilla GHSA-4527-qc36-r4c9
Information Disclosure Mozilla
Medium
Disputed · 4.3 Vendor: mozilla
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Severity by source

Sources disagree (Low–Critical)
Vendor (mozilla) PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
vuln.today AI
4.3 MEDIUM

AV:N for web-triggerable attack; UI:R because user must visit attacker content; C:L for partial credential disclosure with no integrity or availability impact confirmed.

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:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
3.4 LOW
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

3
Analysis Generated
Jul 23, 2026 - 16:41 vuln.today
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 16, 2026 - 11:52 cve.org
MEDIUM 4.3

DescriptionCVE.org

Information disclosure in the Password Manager component. This vulnerability was fixed in Firefox 152.

AnalysisAI

Information disclosure in Firefox's Password Manager component allows a network-based attacker to partially expose sensitive credential data by inducing a user to interact with attacker-controlled content, affecting all Firefox versions prior to 152. The CVSS vector (AV:N/PR:N/UI:R/C:L) confirms no attacker authentication is required, but user interaction is mandatory, limiting automated exploitation. EPSS at 0.18% (8th percentile) and SSVC exploitation status of 'none' indicate negligible real-world exploitation pressure at time of analysis; no public exploit code has been identified.

Technical ContextAI

The affected product is Mozilla Firefox, fully identified by CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*. The vulnerable component is the browser's built-in Password Manager, which stores and autofills user credentials. CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) identifies the root cause as improper control over what information is accessible to parties not intended to receive it - in this context, the Password Manager likely surfaces credential data (passwords, usernames, or metadata) to a web origin or script that should not have access to it. The network attack vector (AV:N) with low complexity (AC:L) and no required privileges (PR:N) suggests this is triggerable via a crafted web page, though user interaction (UI:R) is required. The unchanged scope (S:U) indicates the impact is contained within the Firefox browser process itself rather than escaping to the underlying OS or other applications.

RemediationAI

Upgrade Mozilla Firefox to version 152 or later, which contains the vendor-released patch per Mozilla security advisories mfsa2026-57 (https://www.mozilla.org/security/advisories/mfsa2026-57/) and mfsa2026-60 (https://www.mozilla.org/security/advisories/mfsa2026-60/). Enterprise environments running SUSE or Red Hat Linux distributions should apply the Firefox package updates provided by those vendors, as they maintain separate package builds with their own update timelines. As a compensating control prior to patching, disabling Firefox's built-in Password Manager (via about:preferences#privacy, setting 'Ask to save passwords' to off) eliminates exposure to this specific component; the trade-off is loss of browser-integrated autofill functionality, requiring users to manage credentials externally. Endpoint management teams should prioritize browser update enforcement through group policy or MDM rather than relying on individual user action.

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Same weakness CWE-200 – Information Exposure

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CVE-2024-24919 HIGH POC
8.6
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7.5
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CVE-2017-16894 HIGH POC
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CVE-2017-11165 CRITICAL POC
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CVE-2020-3259 HIGH
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Same technique Information Disclosure

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CVE-2013-2251 CRITICAL POC
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CVE-2017-5638 CRITICAL POC
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CVE-2025-24813 CRITICAL POC
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CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected

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CVE-2026-12320 vulnerability details – vuln.today
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