All vulnerabilities
CVE-2026-103417

Firefox for iOS: Saved credentials can be autofilled after cross-origin navigation

Mozilla Firefox for iOSApplications & CMS
Open in ThreatlineRecord JSON
CVSS
5.5Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.08%Chance of exploitation activity in the next 30 days, higher than 0% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published13 Oct 2026Updated 13 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

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.

Text from CVE List

Affected versions 1

  • Firefox for iOSunaffected: 157.1CVE List

References 2