{"id":"CVE-2026-8971","published":"2026-05-19T12:30:18Z","modified":"2026-05-19T17:10:55Z","title":"Same-origin policy bypass in the Networking: JAR component","vendor":"Mozilla","product":"Firefox","tier":"tail","description":{"text":"Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.","provenance":"source","from":"CVE.org"},"cvss":{"score":6.5,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.00206,"percentile":0.10624,"provenance":"source"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2032604","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-46/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-50/","tags":[]}],"priority":{"score":6.7,"factors":[{"name":"EPSS percentile","points":2.12},{"name":"CVSS severity","points":4.55}]},"vendorSlug":"mozilla","euvd":{"id":"EUVD-2026-30919","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-mozilla-firefox-cwe-346"}}