{"id":"CVE-2026-16381","published":"2026-07-21T12:37:56Z","modified":"2026-07-22T19:18:44Z","title":"Same-origin policy bypass in the Networking: DNS component","vendor":"Mozilla","product":"Firefox","tier":"tail","description":{"text":"Same-origin policy bypass in the Networking: DNS component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.","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":0.0023,"percentile":0.13826,"provenance":"source"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2041001","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-68/","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":9.1,"factors":[{"name":"EPSS percentile","points":2.77},{"name":"CVSS severity","points":6.37}]},"vendorSlug":"mozilla","euvd":{"id":"EUVD-2026-46218","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-mozilla-firefox-cwe-346"}}