{"id":"CVE-2026-12304","published":"2026-06-16T11:52:37Z","modified":"2026-06-16T18:55:05Z","title":"Same-origin policy bypass in the Networking: Cookies component","vendor":"Mozilla","product":"Firefox","tier":"tail","description":{"text":"Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.","provenance":"source","from":"CVE.org"},"cvss":{"score":9.1,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.00189,"percentile":0.08541,"provenance":"source"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2034944","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-57/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-58/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-60/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-61/","tags":[]}],"priority":{"score":8.1,"factors":[{"name":"EPSS percentile","points":1.71},{"name":"CVSS severity","points":6.37}]},"vendorSlug":"mozilla","euvd":{"id":"EUVD-2026-37095","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-mozilla-firefox-cwe-346"}}