CVE-2026-12294
Received Received - Intake
DOM Worker Sandbox Escape in Firefox

Publication date: 2026-06-16

Last updated on: 2026-06-16

Assigner: Mozilla Corporation

Description
Sandbox escape in the DOM: Workers component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37.
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Meta Information
Published
2026-06-16
Last Modified
2026-06-16
Generated
2026-06-16
AI Q&A
2026-06-16
EPSS Evaluated
N/A
NVD
CVE-2026-12294
EUVD
EUVD-2026-37085
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox 152
mozilla firefox_esr 140.12
mozilla firefox_esr 115.37
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability is a sandbox escape in the DOM: Workers component of Mozilla Firefox. It allows code running in a restricted environment (sandbox) to break out of those restrictions, potentially gaining higher privileges or access than intended. The issue was fixed in Firefox versions 152, Firefox ESR 140.12, and Firefox ESR 115.37.

Impact Analysis

This vulnerability could allow malicious code running within a sandboxed environment in Firefox to escape those restrictions, potentially leading to unauthorized access to system resources or sensitive data. This could compromise the security and privacy of the user by allowing attackers to execute code with elevated privileges.

Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 152 or later, or update Firefox ESR to version 140.12 or later, or ESR 115.37 or later where the issue has been fixed.

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