{"id":"CVE-2026-8971","title":"Same-origin policy bypass in the Networking: JAR component","summary":"Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","cwe":["CWE-346"],"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":"2026-07-23","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-8971","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2032604","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"}],"tags":["nvd"],"epss":0.00206,"epssPercentile":0.11017,"ingestedAt":"2026-07-23T20:19:19.225Z","slug":"CVE-2026-8971","body":"## Overview\n\nSame-origin policy bypass in the Networking: JAR 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":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}