{"id":"CVE-2026-2790","published":"2026-02-24T13:33:21Z","modified":"2026-04-13T13:53:42Z","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 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.","provenance":"source","from":"CVE.org"},"cvss":{"score":8.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.00254,"percentile":0.16899,"provenance":"source"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2008426","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-13/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-15/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-16/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-17/","tags":[]}],"priority":{"score":9.5,"factors":[{"name":"EPSS percentile","points":3.38},{"name":"CVSS severity","points":6.16}]},"vendorSlug":"mozilla","euvd":{"id":"EUVD-2026-8443","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-mozilla-firefox-cwe-346"}}