{"id":"CVE-2025-4085","title":"An attacker with control over a content process could potentially leverage the privileged UITour actor to leak sensitive information or escalate privileges","summary":"An attacker with control over a content process could potentially leverage the privileged UITour actor to leak sensitive information or escalate privileges. This vulnerability was fixed in Firefox 138 and Thunderbird 138.","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","cwe":["CWE-269"],"vendor":"mozilla","product":"firefox","affected":["firefox < 138.0","thunderbird < 138.0"],"patched":["firefox 138.0","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-2025-4085","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1915280","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-28/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-31/","label":"security@mozilla.org"}],"tags":["nvd"],"epss":0.003,"epssPercentile":0.20512,"ingestedAt":"2026-09-30T18:17:24.434Z","slug":"CVE-2025-4085","body":"## Overview\n\nAn attacker with control over a content process could potentially leverage the privileged UITour actor to leak sensitive information or escalate privileges. This vulnerability was fixed in Firefox 138 and Thunderbird 138.\n\n## Affected\n\n- `firefox < 138.0`\n- `thunderbird < 138.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 138.0`\n- `thunderbird 138.0`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}