CVE-2026-103417
Received Received - Intake

Firefox for iOS Autofill Credential Exposure via Cross-Origin Navigation

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

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.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-13
AI Q&A
2026-10-13
EPSS Evaluated
N/A
NVD
CVE-2026-103417
EUVD
EUVD-2026-98340

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mozilla firefox_for_ios 157.1

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

Firefox for iOS had a flaw where saved login credentials could be automatically filled into a new page after a cross-origin navigation occurred while the saved-login UI was open. The autofill process was not restricted to the original page and did not check if the origin changed, allowing credentials to be entered into unintended sites.

Detection Guidance

This vulnerability is specific to Firefox for iOS and involves autofill behavior during cross-origin navigation. Detection would require checking if the affected version (before 157.1) is installed and monitoring for unexpected credential autofill events during navigation.

Impact Analysis

This vulnerability could allow an attacker to trick users into entering their saved credentials into a malicious website if they navigate away from the original site while the login prompt is open. This could lead to unauthorized access to user accounts.

Mitigation Strategies

Update Firefox for iOS to version 157.1 or later to patch the vulnerability. Avoid using saved-login features on untrusted networks or pages to reduce exposure.

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