CVE-2025-54143

CRITICAL 9.8

Sandboxed iframes could allow local downloads despite sandbox restrictions

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	mozilla
Product	firefox for ios
Ecosystems	Browser JavaScript
Industries	Technology
Published	Aug 19, 2025
Last Updated	Apr 13, 2026

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Affected Versions

Mozilla / Firefox for iOS

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Narendra Bhati