CVE-2025-55031

critical

Description

Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport. An attacker within Bluetooth range could have used this to trick the user into using their passkey to log the attacker's computer into the target account. This vulnerability was fixed in Firefox for iOS 142 and Focus for iOS 142.

References

https://www.mozilla.org/security/advisories/mfsa2025-69/

https://www.mozilla.org/security/advisories/mfsa2025-68/

https://bugzilla.mozilla.org/show_bug.cgi?id=1979804

https://bugzilla.mozilla.org/show_bug.cgi?id=1979499

Details

Source: Mitre, NVD

Published: 2025-08-19

Updated: 2026-04-13

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.00018