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Mozilla Firefox CVE-2026-12311

| EUVDEUVD-2026-37102 MEDIUM
Function Call With Incorrect Variable or Reference as Argument (CWE-688)
2026-06-16 mozilla GHSA-3pp7-m8f5-89gx
Information Disclosure Mozilla
Medium
Disputed · 4.7 Vendor: mozilla
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Severity by source

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

Network-reachable via browser (AV:N), requires user to visit a page (UI:R), sandbox boundary crossed (S:C), impact limited to partial information disclosure with no integrity or availability effect.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/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:L/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
6.1 MEDIUM
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
Changed
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
Jul 23, 2026 - 16:42 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 4.7

DescriptionCVE.org

Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12.

AnalysisAI

Firefox's Process Sandboxing component allows information disclosure and partial sandbox escape when a user visits a specially crafted webpage, affecting all Firefox versions prior to 152 and Firefox ESR prior to 140.12. The CVSS Scope:Changed metric confirms the flaw crosses the sandbox boundary, while impact is constrained to low confidentiality disclosure with no integrity or availability consequence. No public exploit code exists and SSVC confirms no known exploitation; EPSS at 0.18% (8th percentile) reinforces this is a lower-priority real-world threat despite the sandbox-crossing nature of the bug.

Technical ContextAI

Firefox implements a multi-process architecture where web content is isolated in a sandboxed renderer process, separated from the main browser process and OS via privilege separation enforced by the Security: Process Sandboxing component. CWE-688 (Function Call With Incorrect Variable or Reference as Argument) indicates the root cause is an incorrect argument or reference passed during inter-process communication or sandbox policy enforcement calls, which can allow the sandboxed process to read data from a context it should not have access to. The CVSS S:C (Scope Changed) metric formally captures that exploitation crosses the sandbox trust boundary. Affected products are identified via CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, covering all Firefox release and ESR branches prior to the fixed versions. Tags referencing Red Hat and SUSE indicate downstream Linux distribution packages of Firefox carry this flaw and require separate patching cycles.

RemediationAI

Vendor-released patch: Firefox 152 and Firefox ESR 140.12. Users and administrators should upgrade to Firefox 152 (standard release) or Firefox ESR 140.12 (extended support release) immediately, referencing Mozilla's advisories at https://www.mozilla.org/security/advisories/mfsa2026-57/ and https://www.mozilla.org/security/advisories/mfsa2026-58/. Red Hat and SUSE enterprise users should apply the corresponding vendor-packaged Firefox updates rather than relying solely on upstream binaries, as distribution-level package updates may carry additional backported fixes. Where immediate patching is not feasible, restricting access to untrusted or unknown websites via proxy content filtering reduces user exposure, though this trades browsing functionality for risk reduction. Disabling JavaScript is a more aggressive workaround that would likely prevent exploitation of browser-based sandbox flaws but carries severe usability trade-offs.

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Same weakness CWE-688 – Function Call With Incorrect Variable or Reference as Argument

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5.5

Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-12311 vulnerability details – vuln.today
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