CVE-2025-54143

Sandboxed iframes could allow local downloads despite sandbox restrictions

State: Published
Severity: 9.8 Critical
Published: Aug 19, 2025
Updated: Apr 13, 2026
Reserved: Jul 17, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-693 Protection Mechanism Failure

Affected Products

Product	Versions
Firefox for iOSMozilla	141 and laterNot affected

References

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

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