CVE-2025-54143

Sandboxed iframes could allow local downloads despite sandbox restrictions

CVSS 9.8 CRITICALEPSS 0.4%CWE-693

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Mozilla · Firefox for iOS

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References

https://bugzilla.mozilla.org/show_bug.cgi?id=1912671 https://www.mozilla.org/security/advisories/mfsa2025-60/