{"id":"CVE-2026-74967","published":"2026-08-18T12:23:32Z","modified":"2026-08-18T19:24:18Z","title":"Same-origin policy bypass in the Audio/Video: Playback component","vendor":"Mozilla","product":"Firefox","tier":"tail","description":{"text":"Same-origin policy bypass in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.","provenance":"source","from":"CVE.org"},"cvss":{"score":5.4,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.00165,"percentile":0.05676,"provenance":"source"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2055697","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-74/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-76/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-77/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-78/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-79/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-80/","tags":[]}],"priority":{"score":4.9,"factors":[{"name":"EPSS percentile","points":1.14},{"name":"CVSS severity","points":3.78}]},"vendorSlug":"mozilla","euvd":{"id":"EUVD-2026-60664","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-mozilla-firefox-cwe-346"}}