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CVE-2025-54143 — Sandboxed iframes on webpages could potentially allow downloads to the device, bypassing the expected…

Mozilla · Firefox · Published 19 Aug 2025 · Modified 30 Sept 2026

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.

References

What to do
  1. Check whether Firefox is in your asset inventory.
  2. Patch in the next maintenance window; prioritise internet-facing systems.
  3. Record the decision in your risk register for audit evidence.
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Link: adminadda.com/cve/CVE-2025-54143