{"id":"CVE-2026-109770","title":"Spoofing issue in the DOM: Web Serial component","summary":"Spoofing issue in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.","severity":"medium","published":"2026-10-13","updated":"2026-10-13","sourceUpdated":"2026-10-13T19:18:41.320","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109770","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2059230","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-108/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-109/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-110/","label":"security@mozilla.org"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-13T13:27:04.014Z","vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"epss":0.00186,"epssPercentile":0.08146,"cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-19T20:35:23.124059Z"},"cvssSource":"adp","slug":"CVE-2026-109770","body":"## Overview\n\nSpoofing issue in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225260,"id":"CVE-2026-109770","ts":1792446389452,"field":"cvss","old":null,"new":"6.1"},{"seq":225259,"id":"CVE-2026-109770","ts":1792446389452,"field":"severity","old":"none","new":"medium"}]}