PT-2026-27391 · Mozilla+2 · Firefox Esr+4
Tom Ritter
·
Published
2026-01-01
·
Updated
2026-06-10
·
CVE-2026-4692
CVSS v3.1
10
Critical
| Vector | AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Firefox versions prior to 149
Firefox ESR versions prior to 115.34
Firefox ESR versions prior to 140.9
Thunderbird versions prior to 149
Thunderbird versions prior to 140.9
Description
A sandbox escape issue exists in the Responsive Design Mode component. This allows a malicious actor to potentially bypass security restrictions.
Recommendations
Update Firefox to version 149 or later.
Update Firefox ESR to version 115.34 or later.
Update Firefox ESR to version 140.9 or later.
Update Thunderbird to version 149 or later.
Update Thunderbird to version 140.9 or later.
Fix
RCE
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Weakness Enumeration
Related Identifiers
Affected Products
Firefox
Firefox Esr
Red Os
Rocky Linux
Thunderbird