CVE-2026-4692
Sandbox escape in the Responsive Design Mode component
- State
- Published
- Severity
- 9.6 Critical
- Published
- Mar 24, 2026
- Updated
- Jul 15, 2026
- Reserved
- Mar 23, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.6 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H | CISA-ADP |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H | redhat-SADP |
Weaknesses
- CWE-653 Improper Isolation or Compartmentalization
Affected Products
| Product | Versions |
|---|---|
FirefoxMozilla |
|
ThunderbirdMozilla |
|
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2017643
- 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/
- https://access.redhat.com/security/cve/CVE-2026-4692vdb-entry
- RHBZ#2450748issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4692.json
- https://access.redhat.com/errata/RHSA-2026:8427vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7843vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8315vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:5931vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:6342vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:5932vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:6917vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7840vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8285vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7858vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8850vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7842vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8289vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7838vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8288vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7839vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8286vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7841vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8287vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7845vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8290vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7837vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8284vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:5930vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:6188vendor-advisory
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