CVE-2025-4083
CRITICAL severity · CVSS 9.1 · CWE-653
9.1CVSS CRITICAL
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactNone
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://www.mozilla.org/security/advisories/mfsa2025-28/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-29/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-30/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-31/Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-32/Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1958350
- https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html