{"id":"CVE-2026-92066","title":"Sandbox escape in the Profile Backup component","summary":"Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-693","CWE-653"],"vendor":"mozilla","product":"firefox","affected":["firefox < 156.0.0","thunderbird < 156.0"],"patched":["firefox 156.0.0","thunderbird 156.0"],"published":"2026-09-15","updated":"2026-10-05","sourceUpdated":"2026-10-05T18:46:38.197","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92066","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2058093","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/","label":"security@mozilla.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92066.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92066"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533768"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92066"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92066"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/#CVE-2026-92066"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/#CVE-2026-92066"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00551,"epssPercentile":0.45892,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-21T18:09:43.796684Z"},"scores":{"nvd":9.8,"vendor":3.4,"adp":9.8},"ingestedAt":"2026-09-15T12:36:50.178Z","slug":"CVE-2026-92066","body":"## Overview\n\nSandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.\n\n## Affected\n\n- `firefox < 156.0.0`\n- `thunderbird < 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-2026-92066.json)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208750,"id":"CVE-2026-92066","ts":1790020353497,"field":"cvss","old":"3.4","new":"9.8"},{"seq":208749,"id":"CVE-2026-92066","ts":1790020353497,"field":"severity","old":"low","new":"critical"},{"seq":206352,"id":"CVE-2026-92066","ts":1789663223479,"field":"cvss","old":null,"new":"3.4"},{"seq":206351,"id":"CVE-2026-92066","ts":1789663223479,"field":"severity","old":"none","new":"low"}]}