{"id":"CVE-2025-54143","title":"Sandboxed iframes on webpages could potentially allow downloads to the device, bypassing the expected sandbox restrictions declared on the parent page","summary":"Sandboxed iframes on webpages could potentially allow downloads to the device, bypassing the expected sandbox restrictions declared on the parent page. This vulnerability was fixed in Firefox for iOS 141.","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-693"],"vendor":"mozilla","product":"firefox","affected":["firefox < 141.0"],"patched":["firefox 141.0"],"published":"2025-08-19","updated":"2026-09-30","sourceUpdated":"2026-09-30T18:10:00.190","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-54143","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1912671","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-60/","label":"security@mozilla.org"}],"tags":["nvd"],"epss":0.00481,"epssPercentile":0.39139,"ingestedAt":"2026-09-30T18:17:24.452Z","slug":"CVE-2025-54143","body":"## Overview\n\nSandboxed iframes on webpages could potentially allow downloads to the device, bypassing the expected sandbox restrictions declared on the parent page. This vulnerability was fixed in Firefox for iOS 141.\n\n## Affected\n\n- `firefox < 141.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 141.0`","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}