{"id":"CVE-2025-14331","title":"Same-origin policy bypass in the Request Handling component","summary":"Same-origin policy bypass in the Request Handling component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","cwe":["CWE-346","CWE-346"],"vendor":"mozilla","product":"firefox","affected":["firefox < 115.31.0","firefox < 146.0","firefox >= 116.0, < 140.6.0","thunderbird < 140.6.0","thunderbird < 146.0"],"patched":["firefox 140.6.0","thunderbird 146.0"],"published":"2025-12-09","updated":"2026-09-30","sourceUpdated":"2026-09-30T17:10:00.187","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-14331","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2000218","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-92/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-93/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-94/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-95/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-96/","label":"security@mozilla.org"}],"tags":["nvd"],"epss":0.00187,"epssPercentile":0.07456,"ingestedAt":"2026-09-30T17:13:20.757Z","slug":"CVE-2025-14331","body":"## Overview\n\nSame-origin policy bypass in the Request Handling component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.\n\n## Affected\n\n- `firefox < 115.31.0`\n- `firefox < 146.0`\n- `firefox >= 116.0, < 140.6.0`\n- `thunderbird < 140.6.0`\n- `thunderbird < 146.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 140.6.0`\n- `thunderbird 146.0`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}