{"id":"CVE-2026-100822","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-100822","generatedAt":"2026-10-28T08:11:04.192Z","title":"This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.","description":"Spoofing issue in the Networking: HTTP component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.","published":"2026-09-29T13:17:48.000Z","lastModified":"2026-10-13T16:13:03.000Z","status":"Analyzed","sourceIdentifier":"security@mozilla.org","cvss":{"version":"3.1","score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L"},"cwe":["CWE-451"],"affected":["mozilla/firefox","mozilla/thunderbird"],"epss":{"score":0.00284,"percentile":0.20802,"date":"2026-10-27","history":[{"date":"2026-09-30","score":0.0015,"percentile":0.03571}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.28%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-09-30T23:15:17.000Z","detail":{"from":null,"score":"5.4","severity":"MEDIUM","fromSeverity":null},"summary":"Now scored CVSS 5.4 MEDIUM."},{"kind":"new","label":"New CVE","at":"2026-09-29T13:17:48.000Z","detail":{"score":null,"severity":null,"publishedAt":"2026-09-29T13:17:47.503Z"},"summary":"New CVE, medium severity (CVSS 5.4)."}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2051115","tags":["Permissions Required"],"source":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-100/","tags":["Vendor Advisory"],"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/mfsa2026-103/","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-2026-100822","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."}