CVE-2026-4692
Modified Modified - Updated After Analysis

Sandbox Escape in Firefox Responsive Design Mode Component

Publication date: 2026-03-24

Last updated on: 2026-06-30

Assigner: Mozilla Corporation

Description
Sandbox escape in the Responsive Design Mode component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

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Meta Information

Published
2026-03-24
Last Modified
2026-06-30
Generated
2026-07-06
AI Q&A
2026-03-24
EPSS Evaluated
2026-07-05
NVD
CVE-2026-4692
EUVD
EUVD-2026-14807

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
mozilla firefox to 149.0 (exc)
mozilla firefox to 115.34.0 (exc)
mozilla firefox From 128.0 (inc) to 140.9.0 (exc)
mozilla thunderbird to 149.0 (exc)
mozilla thunderbird to 140.9.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-653 The product does not properly compartmentalize or isolate functionality, processes, or resources that require different privilege levels, rights, or permissions.

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Executive Summary

This vulnerability is a sandbox escape in the Responsive Design Mode component of Firefox. It affects versions of Firefox earlier than 149, Firefox ESR versions earlier than 115.34, and Firefox ESR versions earlier than 140.9.

Impact Analysis

The vulnerability allows an attacker to escape the sandbox environment in the Responsive Design Mode component, potentially enabling them to execute code or perform actions outside the intended restricted environment.

Compliance Impact

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Detection Guidance

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