VulnerabilityModified
CVE-2025-55031
Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport.
CRITICAL 9.8EPSS 0.41%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.41%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.41% probability · 35th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-601
- Affected
- mozilla/firefox · mozilla/firefox focus
- Source
- security@mozilla.org
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1979499Issue Tracking, Permissions Required
- https://bugzilla.mozilla.org/show_bug.cgi?id=1979804Issue Tracking, Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2025-68/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-69/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.