{"id":"CVE-2026-92068","title":"Site isolation issue in the Reader Mode component","summary":"Site isolation issue in the Reader Mode component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.","severity":"medium","cvss":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","cwe":["CWE-346","CWE-653"],"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":"2026-10-05T19:41:33.873","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92068","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2058790","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-2026-92068.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92068"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533782"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92068"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92068"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/#CVE-2026-92068"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/#CVE-2026-92068"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00105,"epssPercentile":0.01053,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-22T15:29:05.821093Z"},"scores":{"nvd":5.4,"vendor":3.4,"adp":5.4},"ingestedAt":"2026-09-15T12:36:50.176Z","slug":"CVE-2026-92068","body":"## Overview\n\nSite isolation issue in the Reader Mode 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 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92068.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":209198,"id":"CVE-2026-92068","ts":1790096862797,"field":"cvss","old":"3.4","new":"5.4"},{"seq":209197,"id":"CVE-2026-92068","ts":1790096862797,"field":"severity","old":"low","new":"medium"},{"seq":206354,"id":"CVE-2026-92068","ts":1789663223497,"field":"cvss","old":null,"new":"3.4"},{"seq":206353,"id":"CVE-2026-92068","ts":1789663223497,"field":"severity","old":"none","new":"low"}]}