{"id":"CVE-2026-8948","title":"Same-origin policy bypass in the DOM: Networking component","summary":"Same-origin policy bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.","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-942","CWE-79"],"vendor":"mozilla","product":"firefox","affected":["firefox < 151.0.0","thunderbird < 151.0.0"],"patched":["firefox 151.0.0","thunderbird 151.0.0"],"published":"2026-05-19","updated":"2026-10-14","sourceUpdated":"2026-10-14T20:10:00.190","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-8948","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2038803","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-46/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-50/","label":"security@mozilla.org"},{"url":"https://access.redhat.com/security/cve/CVE-2026-8948","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479850","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8948.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}],"tags":["nvd"],"epss":0.00452,"epssPercentile":0.37692,"ingestedAt":"2026-10-14T20:53:12.314Z","slug":"CVE-2026-8948","body":"## Overview\n\nSame-origin policy bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.\n\n## Affected\n\n- `firefox < 151.0.0`\n- `thunderbird < 151.0.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 151.0.0`\n- `thunderbird 151.0.0`","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}