CVE-2026-4692

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.

PUBLISHED Reserved 2026-03-23 | Published 2026-03-24 | Updated 2026-04-13 | Assigner mozilla

Product status

Credits

Tom Ritter

References

bugzilla.mozilla.org/show_bug.cgi?id=2017643

www.mozilla.org/security/advisories/mfsa2026-20/

www.mozilla.org/security/advisories/mfsa2026-21/

www.mozilla.org/security/advisories/mfsa2026-22/

www.mozilla.org/security/advisories/mfsa2026-23/

www.mozilla.org/security/advisories/mfsa2026-24/

cve.org (CVE-2026-4692)

nvd.nist.gov (CVE-2026-4692)

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