{"id":"CVE-2026-16398","title":"Site isolation issue in the Graphics component","summary":"Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvssSource":"adp","vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-07-22T17:21:13.018823Z"},"published":"2026-07-21","updated":"2026-10-21","sourceUpdated":"2026-10-21T13:50:38.196Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-16398","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2048345"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-68/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-71/"}],"tags":["cve.org"],"epss":0.00149,"epssPercentile":0.03711,"ingestedAt":"2026-10-21T13:57:01.102Z","slug":"CVE-2026-16398","body":"## Overview\n\nSite isolation issue in the Graphics component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.\n\n## Affected\n\n- `Firefox`\n- `Thunderbird`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}