CVE-2026-103417 Saved credentials can be autofilled after cross-origin navigation
Firefox for iOS could autofill saved credentials into a new page during cross-origin navigation, potentially exposing sensitive login data to attackers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-103417?
CVE-2026-103417 is a medium-severity vulnerability in Mozilla Firefox for iOS, published on 13 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Firefox for iOS could autofill saved credentials into a new page if cross-origin navigation occurred while the saved-login UI was open. Autofill was not bound to the originating page or rejected when its origin changed. This vulnerability was fixed in Firefox for iOS 157.1.
Weakness: CWE-346
Which versions are affected by CVE-2026-103417?
How do I fix CVE-2026-103417?
No fix has been published for CVE-2026-103417 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-103417 being exploited?
There is no known exploitation of CVE-2026-103417 in the wild and no public exploit code.
Sources
Also known as GHSA-6fqq-f23v-gqfc.