{"id":"CVE-2026-92059","title":"Incorrect boundary conditions in the DOM: Editor component","summary":"Incorrect boundary conditions in the DOM: Editor component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.","severity":"critical","cvss":9.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-119","CWE-787"],"vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"published":"2026-09-15","updated":"2026-09-21","sourceUpdated":"2026-09-21T18:17:14.113","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92059","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2068442","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-93/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-96/","label":"security@mozilla.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92059.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92059"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533734"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92059"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92059"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/#CVE-2026-92059"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/#CVE-2026-92059"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-21T17:54:26.594654Z"},"epss":0.00144,"epssPercentile":0.04005,"scores":{"nvd":9.3,"vendor":6.1},"ingestedAt":"2026-09-15T12:36:50.180Z","slug":"CVE-2026-92059","body":"## Overview\n\nIncorrect boundary conditions in the DOM: Editor component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92059.json)","depth":"midnight","depthScore":51,"depthScoreParts":{"impact":51.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208675,"id":"CVE-2026-92059","ts":1790016692527,"field":"cvss","old":"6.1","new":"9.3"},{"seq":208674,"id":"CVE-2026-92059","ts":1790016692527,"field":"severity","old":"medium","new":"critical"},{"seq":206344,"id":"CVE-2026-92059","ts":1789663219968,"field":"cvss","old":null,"new":"6.1"},{"seq":206343,"id":"CVE-2026-92059","ts":1789663219968,"field":"severity","old":"none","new":"medium"}]}