{"id":"CVE-2026-92071","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":"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-119","CWE-501"],"vendor":"mozilla","product":"firefox","affected":["firefox < 153.3.0","firefox >= 154.0.0, < 156.0.0","thunderbird < 153.3.0","thunderbird >= 154.0, < 156.0"],"patched":["firefox 156.0.0","thunderbird 156.0"],"published":"2026-09-15","updated":"2026-10-05","sourceUpdated":"2026-10-05T19:40:32.353","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92071","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2061231","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-2026-92071.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92071"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533733"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92071"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92071"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/#CVE-2026-92071"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/#CVE-2026-92071"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00239,"epssPercentile":0.14933,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-22T15:25:58.982715Z"},"scores":{"nvd":9.6,"vendor":3.4,"adp":9.6},"ingestedAt":"2026-09-15T12:36:50.176Z","slug":"CVE-2026-92071","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## Affected\n\n- `firefox < 153.3.0`\n- `firefox >= 154.0.0, < 156.0.0`\n- `thunderbird < 153.3.0`\n- `thunderbird >= 154.0, < 156.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 156.0.0`\n- `thunderbird 156.0`\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-2026-92071.json)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":52.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":209204,"id":"CVE-2026-92071","ts":1790096863129,"field":"cvss","old":"3.4","new":"9.6"},{"seq":209203,"id":"CVE-2026-92071","ts":1790096863129,"field":"severity","old":"low","new":"critical"},{"seq":206330,"id":"CVE-2026-92071","ts":1789663218067,"field":"cvss","old":null,"new":"3.4"},{"seq":206329,"id":"CVE-2026-92071","ts":1789663218067,"field":"severity","old":"none","new":"low"}]}