{"id":"CVE-2026-100804","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-100804","generatedAt":"2026-10-28T02:57:14.185Z","title":"Sandbox escape due to use-after-free in the Preferences: Backend component.","description":"Sandbox escape due to use-after-free in the Preferences: Backend component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.","published":"2026-09-29T13:17:45.000Z","lastModified":"2026-10-19T17:38:58.000Z","status":"Analyzed","sourceIdentifier":"security@mozilla.org","cvss":{"version":"3.1","score":9.6,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"},"cwe":["CWE-416"],"affected":["mozilla/firefox","mozilla/thunderbird"],"epss":{"score":0.00282,"percentile":0.20571,"date":"2026-10-26","history":[{"date":"2026-09-30","score":0.0027,"percentile":0.17299}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.28%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-09-29T15:45:16.000Z","detail":{"from":null,"score":"9.6","severity":"CRITICAL","fromSeverity":null},"summary":"Now scored CVSS 9.6 CRITICAL."},{"kind":"new","label":"New CVE","at":"2026-09-29T13:17:45.000Z","detail":{"score":null,"severity":null,"publishedAt":"2026-09-29T13:17:45.493Z"},"summary":"New CVE, critical severity (CVSS 9.6)."}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2058647","tags":["Permissions Required"],"source":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-101/","tags":["Vendor Advisory"],"source":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-97/","tags":["Vendor Advisory"],"source":"security@mozilla.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-100804","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}