CVE-2026-4692

Sandbox escape in the Responsive Design Mode component

Critical · published March 24, 2026

CVSS v3.1
9.6
EPSS
1%
Percentile
42.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.6 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00506 · 42.3th percentile
Published
2026-03-24T12:30Z
EPSS history
Timeline
  • 24 MAR 12:30Z
    Sandbox escape in the Responsive Design Mode component
    cvelistv5