CVE-2026-4692
Sandbox escape in the Responsive Design Mode component
CRITICAL 10.0EPSS 0.5%
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.
- Affected
- Mozilla · Firefox · Thunderbird
- CVSS v3.1 NVD
- 10.0 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - CVSS v3.1 CNA
- 7.5 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS v3.1 CNA
- 9.6 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H - EPSS
- 0.49% chance of exploitation in the next 30 days, 41st percentile
- Published
- 2026-03-24
- Updated
- 2026-07-15
Proof-of-concept exploits (1)
- SneakyNachos/CVE-2026-4692-trust-me-im-in-rdm1★ · 2026-08-25
Security advisories
- https://www.mozilla.org/security/advisories/mfsa2026-20
- https://www.mozilla.org/security/advisories/mfsa2026-21
- https://www.mozilla.org/security/advisories/mfsa2026-22
- https://www.mozilla.org/security/advisories/mfsa2026-23
- https://www.mozilla.org/security/advisories/mfsa2026-24