{"id":"CVE-2026-92065","title":"Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component","summary":"Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/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":"2026-09-21T19:17:16.580","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92065","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2058018","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-2026-92065.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92065"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533796"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92065"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92065"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/#CVE-2026-92065"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/#CVE-2026-92065"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00144,"epssPercentile":0.04005,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-21T18:07:03.297070Z"},"scores":{"nvd":8.8,"vendor":3.4,"adp":8.8},"ingestedAt":"2026-09-15T12:36:50.175Z","slug":"CVE-2026-92065","body":"## Overview\n\nSandbox escape due to incorrect boundary conditions in the Widget: Win32 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** · Low · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92065.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208748,"id":"CVE-2026-92065","ts":1790020353487,"field":"cvss","old":"3.4","new":"8.8"},{"seq":208747,"id":"CVE-2026-92065","ts":1790020353487,"field":"severity","old":"low","new":"high"},{"seq":206360,"id":"CVE-2026-92065","ts":1789663223525,"field":"cvss","old":null,"new":"3.4"},{"seq":206359,"id":"CVE-2026-92065","ts":1789663223525,"field":"severity","old":"none","new":"low"}]}