CVE-2026-12296
Received Received - Intake
Security Sandbox Escape in Firefox

Publication date: 2026-06-16

Last updated on: 2026-06-16

Assigner: Mozilla Corporation

Description
Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12.
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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-2026-12296
EUVD
EUVD-2026-37087
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox 152
mozilla firefox_esr 140.12
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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 Security: Process Sandboxing component of Mozilla Firefox. It allows an attacker to break out of the restricted sandbox environment that is designed to isolate processes, potentially gaining higher privileges or access to the system than intended.

The issue was addressed and fixed in Firefox version 152 and Firefox ESR 140.12.

Impact Analysis

By exploiting this sandbox escape vulnerability, an attacker could potentially execute code outside the sandbox restrictions, leading to unauthorized access to system resources or sensitive data.

This could result in compromise of the affected system's security, including possible data theft, system manipulation, or further exploitation.

Mitigation Strategies

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

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