{"id":"CVE-2026-109755","title":"Sandbox escape in the DOM: Content Processes component","summary":"Sandbox escape in the DOM: Content Processes component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.","severity":"critical","cvss":9.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","cwe":["CWE-693"],"vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"published":"2026-10-13","updated":"2026-10-15","sourceUpdated":"2026-10-15T20:17:08.070","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109755","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2068448","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-109/","label":"security@mozilla.org"}],"tags":["nvd","cve.org"],"epss":0.00338,"epssPercentile":0.27065,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T19:55:44.542082Z"},"ingestedAt":"2026-10-13T13:27:04.008Z","slug":"CVE-2026-109755","body":"## Overview\n\nSandbox escape in the DOM: Content Processes component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":52.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":222707,"id":"CVE-2026-109755","ts":1792097056462,"field":"cvss","old":null,"new":"9.6"},{"seq":222706,"id":"CVE-2026-109755","ts":1792097056462,"field":"severity","old":"none","new":"critical"}]}