{"id":"CVE-2026-92074","title":"Mitigation bypass in the Popup Blocker component","summary":"Mitigation bypass in the Popup Blocker component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","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":"2026-10-05T19:32:26.820","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92074","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2063539","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-2026-92074.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92074"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533805"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92074"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92074"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/#CVE-2026-92074"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/#CVE-2026-92074"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00109,"epssPercentile":0.01207,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-22T15:54:20.778712Z"},"scores":{"nvd":8.8,"vendor":3.4,"adp":8.8},"ingestedAt":"2026-09-15T13:37:33.318Z","slug":"CVE-2026-92074","body":"## Overview\n\nMitigation bypass in the Popup Blocker 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** · Low · updated 2026-09-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92074.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":209248,"id":"CVE-2026-92074","ts":1790100526654,"field":"cvss","old":"3.4","new":"8.8"},{"seq":209247,"id":"CVE-2026-92074","ts":1790100526654,"field":"severity","old":"low","new":"high"},{"seq":207018,"id":"CVE-2026-92074","ts":1789749740853,"field":"cvss","old":null,"new":"3.4"},{"seq":207017,"id":"CVE-2026-92074","ts":1789749740853,"field":"severity","old":"none","new":"low"}]}