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Mozilla Firefox CVE-2026-12295

| EUVDEUVD-2026-37086 CRITICAL
Protection Mechanism Failure (CWE-693)
2026-06-16 mozilla GHSA-pc23-5ppw-9j7m
Information Disclosure Mozilla
9.6
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
9.6 CRITICAL
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
vuln.today AI
9.6 CRITICAL

Remote drive-by via web content (AV:N, PR:N) but victim must load a page (UI:R); a sandbox escape crosses the isolation boundary (S:C) with total C/I/A impact.

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

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

3
Analysis Generated
Jul 23, 2026 - 16:46 vuln.today
CVE Published
Jun 16, 2026 - 11:52 cve.org
CRITICAL 9.6
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37.

AnalysisAI

Sandbox escape in Mozilla Firefox's DOM: Navigation component allows a remote attacker to break out of the content-process sandbox when a victim visits a malicious web page, gaining code execution and full data access at the browser-host boundary. The flaw affects Firefox before 152 and the ESR 140.x and 115.x branches and carries a critical 9.6 CVSS with a changed scope. There is no public exploit identified at time of analysis, and EPSS (0.16%, 5th percentile) plus SSVC 'Exploitation: none' indicate no observed exploitation yet.

Technical ContextAI

The vulnerability sits in Firefox's DOM Navigation code, part of the browser engine that governs page/document loading, session history and cross-origin navigation transitions. Modern Firefox isolates web content in low-privilege child processes; a sandbox escape means untrusted JavaScript/DOM interactions can subvert the protection boundary that normally confines rendered content, which is why CVSS marks Scope=Changed. The CWE-693 (Protection Mechanism Failure) classification reflects that the root cause is a bypass or breakdown of an intended security control (the sandbox/isolation model) rather than a simple memory-safety bug in isolation. The affected CPE is cpe:2.3:a:mozilla:firefox, and the shared Gecko engine means Firefox ESR and downstream Red Hat/SUSE rebuilds inherit the defect.

RemediationAI

Apply the vendor fix: upgrade to Firefox 152, Firefox ESR 140.12, or Firefox ESR 115.37, whichever branch you run (Vendor-released patch confirmed by Mozilla advisories mfsa2026-57..61). Enterprise Linux users should apply the corresponding distro updates - Red Hat via RHSA-2026:27733/27717/27734/29940/30846 (https://access.redhat.com/errata/RHSA-2026:27733) and SUSE via SUSE-SU-2026:2582/2583 (https://www.suse.com/support/update/SUSE-SU-2026:2582/). Because exploitation requires the user to load malicious content, effective interim controls until patching are to restrict browsing of untrusted sites, deploy web/URL filtering and network egress controls, and enforce updates via enterprise policy (e.g. Firefox ESR update channel), accepting the usability trade-off of blocking some sites; disabling JavaScript would reduce exposure but breaks most modern sites and is generally impractical.

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Same weakness CWE-693 – Protection Mechanism Failure

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Desktop Applications 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed

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CVE-2026-12295 vulnerability details – vuln.today
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