{"id":"CVE-2025-4083","title":"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 e…","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 e…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-653"],"vendor":"mozilla","product":"firefox","affected":["firefox < 115.23","firefox < 138.0","firefox >= 128.0, < 128.10","thunderbird < 128.10.0","thunderbird < 138.0"],"patched":["firefox 128.10","thunderbird 138.0"],"published":"2025-04-29","updated":"2026-09-30","sourceUpdated":"2026-09-30T18:10:00.190","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-4083","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1958350","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-28/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-29/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-30/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-31/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-32/","label":"security@mozilla.org"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00451,"epssPercentile":0.36816,"ingestedAt":"2026-09-30T18:17:24.433Z","slug":"CVE-2025-4083","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `firefox < 115.23`\n- `firefox < 138.0`\n- `firefox >= 128.0, < 128.10`\n- `thunderbird < 128.10.0`\n- `thunderbird < 138.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 128.10`\n- `thunderbird 138.0`","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}