Privilege escalation flaw in Firefox for iOS

Summary

Firefox for iOS has a privilege escalation flaw, which Mozilla says was fixed in version 160.0. Users of earlier versions are affected.

What to do

Update Firefox for iOS to 160.0 or later.

Products and platforms

• iOS
• Firefox for iOS

CVE IDs

• CVE-2026-121843 (opens in a new tab)

Sources

• CVE record: cve.org (opens in a new tab)

Times

First published 2026-11-09 13:42 UTC

First seen 2026-11-09 13:50 UTC