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Mozilla Firefox CVE-2026-12313

| EUVDEUVD-2026-37104 MEDIUM
Improper Privilege Management (CWE-269)
2026-06-16 mozilla GHSA-h8rm-48w7-7wp9
Privilege Escalation Mozilla Information Disclosure Red Hat Suse
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 delivery via browser, no privileges needed, user must visit malicious page (UI:R), sandbox escape changes scope (S:C), limited confidentiality-only impact 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

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
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
Jun 16, 2026 - 15:51 vuln.today
CVSS changed
Jun 16, 2026 - 15:22 NVD
4.7 (MEDIUM)
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

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

Sandbox escape with information disclosure in Mozilla Firefox's Process Sandboxing component allows a remote attacker to break out of the browser sandbox and read sensitive data from the host environment when a user visits attacker-controlled content. Affected versions span all Firefox releases prior to 152 and all Firefox ESR releases prior to 140.12, patched by Mozilla in mfsa2026-57 and mfsa2026-58. No public exploit identified at time of analysis and SSVC signals no current exploitation activity, keeping real-world urgency at moderate priority despite the scope-changing nature of the flaw.

Technical ContextAI

The Process Sandboxing component in Firefox is a security boundary designed to isolate web content processes from the host operating system, limiting the blast radius of content-layer exploitation. CWE-269 (Improper Privilege Management) identifies the root cause as a failure to correctly enforce privilege constraints within or around this sandboxing layer, permitting a content process to perform operations or access resources above its intended privilege level. The CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* confirms all platform variants of Firefox (Windows, macOS, Linux) are within scope. The CVSS scope flag S:C is consistent with this - a sandbox escape by definition transitions impact from the sandboxed vulnerable component to a component (the host system or other processes) outside it. The disclosed impact is limited to confidentiality (C:L), consistent with information disclosure rather than arbitrary code execution or persistent installation.

RemediationAI

The primary fix is to upgrade Mozilla Firefox to version 152 or later, or Mozilla Firefox ESR to version 140.12 or later; these are the vendor-confirmed patched releases per mfsa2026-57 and mfsa2026-58 respectively at https://www.mozilla.org/security/advisories/mfsa2026-57/ and https://www.mozilla.org/security/advisories/mfsa2026-58/. Enterprise deployments using ESR should prioritize the 140.12 ESR release to remain on a supported long-term channel while receiving the fix. If immediate patching is infeasible, restrict Firefox use to trusted browsing contexts only and consider deploying network-level controls (e.g., web proxy filtering for untrusted or external content) to reduce exposure to attacker-controlled pages that could trigger the exploit - note these controls add friction without eliminating the root vulnerability. No partial workaround exists that disables the Process Sandboxing component safely without further increasing attack surface.

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Same weakness CWE-269 – Improper Privilege Management

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CVE-2017-5689 CRITICAL POC
9.8
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9.8
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CVE-2016-0151 HIGH POC
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CVE-2013-0643 HIGH
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Same technique Privilege Escalation

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CVE-2025-47812 CRITICAL POC
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9.8
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9.8
CVE-2016-10372 CRITICAL POC
9.8
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10.0
CVE-2012-0297 CRITICAL POC
10.0

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-2026-12313 vulnerability details – vuln.today
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