CVE-2026-12313
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Security Sandbox Escape in Firefox

Publication date: 2026-06-16

Last updated on: 2026-06-16

Assigner: Mozilla Corporation

Description
Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

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Meta Information

Published
2026-06-16
Last Modified
2026-06-16
Generated
2026-07-06
AI Q&A
2026-06-16
EPSS Evaluated
2026-07-05
NVD
CVE-2026-12313
EUVD
EUVD-2026-37104

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 152.0 (exc)
mozilla firefox From 140.0 (inc) to 140.12.0 (exc)
mozilla thunderbird to 152.0.0 (exc)
mozilla thunderbird From 140.0 (inc) to 140.12.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-269 The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

Attack-Flow Graph

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Executive Summary

This vulnerability involves information disclosure and sandbox escape within the Security: Process Sandboxing component of Mozilla Firefox. It allows an attacker to potentially bypass the sandbox restrictions designed to isolate processes, leading to unauthorized access to information.

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

Impact Analysis

Exploitation of this vulnerability could allow an attacker to escape the sandbox environment, potentially gaining access to sensitive information that should be protected by the sandbox. This could lead to unauthorized data exposure or further compromise of the system running Firefox.

Mitigation Strategies

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

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