CVE-2026-103417

Saved credentials can be autofilled after cross-origin navigation

State: Published
Severity: 5.5 Medium
Published: Oct 13, 2026
Updated: Oct 13, 2026
Reserved: Sep 30, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N	CISA-ADP

Weaknesses

CWE-346 Origin Validation Error

Affected Products

Product	Versions
Firefox for iOSMozilla	157.1 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2068171
https://www.mozilla.org/security/advisories/mfsa2026-105/

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