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CVE-2026-4692

CriticalPublished

Sandbox escape in the Responsive Design Mode component

Published: Mar 24, 2026
Updated: Jul 15, 2026
Assigning CNA: mozilla
Evidence observed: Aug 26, 2026

Primary CVSS

10.0/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 40.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-4692-trust-me-im-in-rdmPoC
Proof-of-concept exploit for Firefox BrowsingContext authorization bypass (CVE-2026-4692), demonstrating forged IPC messages to set InRDMPane and enable privileged UI touch-event injection.

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