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Mozilla Firefox CVE-2026-12294

| EUVDEUVD-2026-37085 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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker hosts malicious page
Delivery
Lure victim via phishing or malvertising
Exploit
Victim's Firefox loads page
Execution
Worker script triggers DOM sandbox escape
Persist
Code executes outside content sandbox
Impact
Attacker gains host-level foothold
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Vulnerability AssessmentAI

Exploitation Victim must use an unpatched Firefox (pre-152, ESR pre-140.12, or ESR pre-115.37) and must navigate to attacker-controlled web content (UI:R - user interaction limited to visiting a page, no click-through required); JavaScript and Web Workers must be enabled (both are on by default). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals conflict in interesting ways: the CVSS 3.1 base score is 9.6 critical (AV:N/AC:L/PR:N/UI:R/S:C, with full CIA impact) reflecting that a remote attacker only needs the victim to load a page, but the EPSS score sits at 0.16% (5th percentile) and CISA SSVC records Exploitation=none and Automatable=no with Technical Impact=total. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a malicious or compromised web page containing JavaScript that spawns a Web Worker crafted to trigger the sandbox-escape primitive, then lures a Firefox user to visit the page via phishing or malvertising. When the victim loads the page (UI:R, satisfied simply by navigation), the Worker code escapes the content-process sandbox and obtains code execution with the privileges of the Firefox process on the host. …
Remediation 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.). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify Firefox deployments across your organization and assess exposure for systems handling sensitive data. …

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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-2026-12294 vulnerability details – vuln.today
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