{"id":"CVE-2026-92050","title":"Sandbox escape due to race condition in the XPConnect component","summary":"Sandbox escape due to race condition in the XPConnect component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","cwe":["CWE-362","CWE-368"],"vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"published":"2026-09-15","updated":"2026-09-21","sourceUpdated":"2026-09-21T18:17:13.537","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92050","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2061387","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/","label":"security@mozilla.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92050.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92050"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533798"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92050"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92050"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/#CVE-2026-92050"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/#CVE-2026-92050"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-21T17:39:54.136153Z"},"epss":0.00142,"epssPercentile":0.03863,"scores":{"nvd":9.1,"vendor":6.1,"adp":9.1},"ingestedAt":"2026-09-15T12:36:50.183Z","slug":"CVE-2026-92050","body":"## Overview\n\nSandbox escape due to race condition in the XPConnect component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, … · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92050.json)","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208671,"id":"CVE-2026-92050","ts":1790016692164,"field":"cvss","old":"6.1","new":"9.1"},{"seq":208670,"id":"CVE-2026-92050","ts":1790016692164,"field":"severity","old":"medium","new":"critical"},{"seq":206372,"id":"CVE-2026-92050","ts":1789663223617,"field":"cvss","old":null,"new":"6.1"},{"seq":206371,"id":"CVE-2026-92050","ts":1789663223617,"field":"severity","old":"none","new":"medium"}]}