CVE-2025-4083

Description

A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process instead of the intended frame, potentially enabling a sandbox escape. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.

PUBLISHED Reserved 2025-04-29 | Published 2025-04-29 | Updated 2026-04-13 | Assigner mozilla

Product status

Credits

Nika Layzell

References

lists.debian.org/debian-lts-announce/2025/05/msg00024.html

bugzilla.mozilla.org/show_bug.cgi?id=1958350

www.mozilla.org/security/advisories/mfsa2025-28/

www.mozilla.org/security/advisories/mfsa2025-29/

www.mozilla.org/security/advisories/mfsa2025-30/

www.mozilla.org/security/advisories/mfsa2025-31/

www.mozilla.org/security/advisories/mfsa2025-32/

cve.org (CVE-2025-4083)

nvd.nist.gov (CVE-2025-4083)

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