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Vulnerability record · CVE-2025-55031 · published 19 August 2025

CVE-2025-55031: Mozilla firefox open redirect vulnerability

Mozilla · Firefox

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.

9.8 CVSS 3.1 Critical EPSS 0.41% · top 66.8% CWE-601 · Open redirect
9.8CVSS 3.1 base score
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
30 Sep 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.mozilla.org/show_bug.cgi?id=1979499 Issue TrackingPermissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1979804 Issue TrackingPermissions Required
https://www.mozilla.org/security/advisories/mfsa2025-68/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-69/ Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-55031), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.