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Mozilla Firefox EUVDEUVD-2026-37085

| CVE-2026-12294 CRITICAL
Protection Mechanism Failure (CWE-693)
2026-06-16 mozilla GHSA-j3ch-r4qx-fpvf
Mozilla Information Disclosure
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
8.3 HIGH

Remote via web content (AV:N), no auth (PR:N), user must visit a page (UI:R); sandbox-escape exploits are non-trivial so AC:H; scope changes (S:C) with full host-process impact.

3.1 AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
4.0 AV:N/AC:H/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

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
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
Jun 18, 2026 - 19:39 vuln.today
CVSS changed
Jun 18, 2026 - 19:38 NVD
9.6 (None) 9.6 (CRITICAL)
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Sandbox escape in the DOM: Workers 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 Workers component allows remote attackers to break out of the browser's content process sandbox when a user visits a malicious web page. The flaw affects Firefox prior to 152, Firefox ESR before 140.12, and Firefox ESR before 115.37, with no public exploit identified at time of analysis despite a critical 9.6 CVSS score. EPSS exploitation probability is low at 0.16% and CISA SSVC marks exploitation as 'none', suggesting no in-the-wild abuse has been observed yet.

Technical ContextAI

The vulnerability resides in the DOM: Workers component of Gecko, the rendering engine underlying Firefox, which implements the Web Workers API for running scripts in background threads isolated from the main page context. Firefox's multi-process architecture relies on a content-process sandbox to confine untrusted web content; a flaw here (CWE-693, Protection Mechanism Failure) means that sandbox boundary can be bypassed from JavaScript executing inside a Worker. The scope-change flag (S:C) in the CVSS vector is consistent with the impact crossing the sandbox trust boundary into the broader browser/host process.

RemediationAI

Vendor-released patches are available: upgrade to Firefox 152, Firefox ESR 140.12, or Firefox ESR 115.37 as appropriate for your channel; the matching Mozilla Foundation Security Advisories are MFSA2026-57 through MFSA2026-61 (https://www.mozilla.org/security/advisories/mfsa2026-57/ etc.). Until patches can be deployed, compensating controls include enforcing browser-update policies via MDM/Group Policy, blocking unknown external sites at the egress proxy for high-risk endpoints, and disabling JavaScript on untrusted origins via NoScript or enterprise policy - note the latter breaks most modern web applications and is only practical for narrowly scoped kiosk or jump-host use cases. The Bugzilla entry at https://bugzilla.mozilla.org/show_bug.cgi?id=2039873 may remain restricted under Mozilla's standard embargo until broader deployment.

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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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EUVD-2026-37085 vulnerability details – vuln.today
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