{"id":"CVE-2026-92038","title":"Mitigation bypass in the Remote Settings Client component","summary":"Mitigation bypass in the Remote Settings Client component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-693","CWE-807"],"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":"2026-10-05T17:57:14.487","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92038","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2068952","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-2026-92038.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92038"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533761"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92038"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92038"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/#CVE-2026-92038"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/#CVE-2026-92038"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00316,"epssPercentile":0.24329,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-21T17:23:37.995021Z"},"scores":{"nvd":9.1,"vendor":7.5,"adp":9.1},"ingestedAt":"2026-09-15T12:36:50.187Z","slug":"CVE-2026-92038","body":"## Overview\n\nMitigation bypass in the Remote Settings Client 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** · Important · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92038.json)","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208660,"id":"CVE-2026-92038","ts":1790016691869,"field":"cvss","old":"7.5","new":"9.1"},{"seq":208659,"id":"CVE-2026-92038","ts":1790016691869,"field":"severity","old":"high","new":"critical"},{"seq":207028,"id":"CVE-2026-92038","ts":1789749742215,"field":"cvss","old":null,"new":"7.5"},{"seq":207027,"id":"CVE-2026-92038","ts":1789749742215,"field":"severity","old":"none","new":"high"}]}