{"id":"CVE-2026-109772","published":"2026-10-13T12:29:33Z","modified":"2026-10-26T19:41:32Z","title":"Same-origin policy bypass in the DevTools component","vendor":"Mozilla","product":"Firefox","tier":"tail","description":{"text":"Same-origin policy bypass in the DevTools component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.","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":0.00181,"percentile":0.07608,"provenance":"source"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2066063","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-109/","tags":[]}],"priority":{"score":7.9,"factors":[{"name":"EPSS percentile","points":1.52},{"name":"CVSS severity","points":6.37}]},"vendorSlug":"mozilla","euvd":{"id":"EUVD-2026-98532","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-mozilla-firefox-cwe-346"}}