{"id":"CVE-2026-6771","state":"PUBLISHED","title":"Mitigation bypass in the DOM: Security component","description":"Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.","publishedAt":"2026-04-21T12:41:03.920Z","updatedAt":"2026-05-27T16:51:29.513Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"mozilla","products":["Mozilla Firefox","Mozilla Thunderbird"],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"140.10","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"150","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"140.10","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"150","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=2025067","https://www.mozilla.org/security/advisories/mfsa2026-30/","https://www.mozilla.org/security/advisories/mfsa2026-32/","https://www.mozilla.org/security/advisories/mfsa2026-33/","https://www.mozilla.org/security/advisories/mfsa2026-34/"],"weaknesses":["CWE-288"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/6xxx/CVE-2026-6771.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-6771","state":"PUBLISHED","datePublished":"2026-04-21T12:41:03.920Z","dateUpdated":"2026-05-27T16:51:29.513Z","assignerShortName":"mozilla","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateReserved":"2026-04-21T12:41:03.627Z"},"containers":{"cna":{"title":"Mitigation bypass in the DOM: Security component","descriptions":[{"lang":"en","value":"Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10."}],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"140.10","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"150","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"140.10","status":"unaffected","lessThanOrEqual":"140.*","versionType":"rpm"},{"version":"150","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2025067"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-30/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-32/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-33/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-34/"}],"providerMetadata":{"shortName":"mozilla","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateUpdated":"2026-04-21T23:35:05.769Z"},"credits":[{"lang":"en","value":"Rayhan Hanaputra"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.8,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-04-21T19:31:19.014643Z","id":"CVE-2026-6771","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-288","type":"CWE","lang":"en","description":"CWE-288 Authentication Bypass Using an Alternate Path or Channel"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-27T16:51:29.513Z"}}]}}}