{"id":"CVE-2026-16349","published":"2026-07-21T12:37:31Z","modified":"2026-07-22T19:18:14Z","title":"Same-origin policy bypass in the DOM: Navigation component","vendor":"Mozilla","product":"Firefox","tier":"tail","description":{"text":"Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.","provenance":"source","from":"CVE.org"},"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.00299,"percentile":0.22567,"provenance":"source"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2034682","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-68/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-69/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-70/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-71/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-72/","tags":[]}],"priority":{"score":11.4,"factors":[{"name":"EPSS percentile","points":4.51},{"name":"CVSS severity","points":6.86}]},"vendorSlug":"mozilla","euvd":{"id":"EUVD-2026-46189","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-mozilla-firefox-cwe-346"}}