{"id":"CVE-2026-92019","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 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","cwe":["CWE-693","CWE-807"],"vendor":"mozilla","product":"firefox","affected":["firefox < 115.41.0","firefox >= 116.0, < 140.16.0","firefox >= 141.0, < 153.3.0","firefox >= 154.0.0, < 156.0.0","thunderbird < 140.16.0","thunderbird >= 141.0, < 153.3.0","thunderbird >= 154.0, < 156.0"],"patched":["firefox 156.0.0","thunderbird 156.0"],"published":"2026-09-15","updated":"2026-10-06","sourceUpdated":"2026-10-06T14:40:12.207","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92019","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2065636","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-91/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-92/","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/mfsa2026-95/","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-2026-92019.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92019"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533740"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92019"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92019"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-92/#CVE-2026-92019"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-95/#CVE-2026-92019"},{"url":"https://access.redhat.com/errata/RHSA-2026:69461"},{"url":"https://access.redhat.com/errata/RHSA-2026:69462"},{"url":"https://access.redhat.com/errata/RHSA-2026:70642"},{"url":"https://access.redhat.com/errata/RHSA-2026:71652"},{"url":"https://access.redhat.com/errata/RHSA-2026:73130"},{"url":"https://access.redhat.com/errata/RHSA-2026:73971"},{"url":"https://access.redhat.com/errata/RHSA-2026:82818"},{"url":"https://access.redhat.com/errata/RHSA-2026:81392"},{"url":"https://access.redhat.com/errata/RHSA-2026:82122"},{"url":"https://access.redhat.com/errata/RHSA-2026:81913"},{"url":"https://access.redhat.com/errata/RHSA-2026:82720"},{"url":"https://access.redhat.com/errata/RHSA-2026:81912"},{"url":"https://access.redhat.com/errata/RHSA-2026:82780"},{"url":"https://access.redhat.com/errata/RHSA-2026:81394"},{"url":"https://access.redhat.com/errata/RHSA-2026:81393"},{"url":"https://access.redhat.com/errata/RHSA-2026:82817"},{"url":"https://access.redhat.com/errata/RHSA-2026:81884"},{"url":"https://access.redhat.com/errata/RHSA-2026:83496"},{"url":"https://access.redhat.com/errata/RHSA-2026:82779"},{"url":"https://access.redhat.com/errata/RHSA-2026:83076"},{"url":"https://access.redhat.com/errata/RHSA-2026:83077"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00307,"epssPercentile":0.23413,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-21T16:45:25.729934Z"},"scores":{"nvd":8.1,"vendor":7.5},"ingestedAt":"2026-09-15T12:36:50.194Z","slug":"CVE-2026-92019","body":"## Overview\n\nMitigation bypass in the Remote Settings Client component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.\n\n## Affected\n\n- `firefox < 115.41.0`\n- `firefox >= 116.0, < 140.16.0`\n- `firefox >= 141.0, < 153.3.0`\n- `firefox >= 154.0.0, < 156.0.0`\n- `thunderbird < 140.16.0`\n- `thunderbird >= 141.0, < 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 · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 10 · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92019.json)\n- **RHSA-2026:69461** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69461)\n- **RHSA-2026:69462** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69462)\n- **RHSA-2026:70642** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:70642)\n- **RHSA-2026:71652** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71652)\n- **RHSA-2026:73130** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:73130)\n- **RHSA-2026:73971** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-09-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:73971)\n- **RHSA-2026:82818** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-10-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:82818)\n- **RHSA-2026:81392** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-10-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:81392)\n- **RHSA-2026:82122** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82122)\n- **RHSA-2026:81913** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:81913)\n- **RHSA-2026:82720** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-10-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:82720)\n- **RHSA-2026:81912** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:81912)\n- **RHSA-2026:82780** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-10-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:82780)\n- **RHSA-2026:83496** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS) · released 2026-10-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:83496)\n- **RHSA-2026:82779** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-10-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:82779)\n- **RHSA-2026:83076** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-10-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:83076)","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":208608,"id":"CVE-2026-92019","ts":1790013028529,"field":"cvss","old":"7.5","new":"8.1"},{"seq":206402,"id":"CVE-2026-92019","ts":1789663224631,"field":"cvss","old":null,"new":"7.5"},{"seq":206401,"id":"CVE-2026-92019","ts":1789663224631,"field":"severity","old":"none","new":"high"}]}