{"id":"CVE-2026-3846","published":"2026-03-10T15:03:50Z","modified":"2026-04-13T13:54:04Z","title":"Same-origin policy bypass in the CSS Parsing and Computation component","vendor":"Mozilla","product":"Firefox","tier":"tail","description":{"text":"Same-origin policy bypass in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 148.0.2.","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:R/S:U/C:N/I:H/A:N","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.00119,"percentile":0.01741,"provenance":"source"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2018400","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-19/","tags":[]}],"priority":{"score":4.9,"factors":[{"name":"EPSS percentile","points":0.35},{"name":"CVSS severity","points":4.55}]},"vendorSlug":"mozilla","euvd":{"id":"EUVD-2026-10504","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-mozilla-firefox-cwe-346"}}