CVE-2025-55031

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 v3.1 Score

9.8

CRITICAL

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

Weakness Type (CWE)

CWE-601 CWE-601

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 142.0
mozilla	firefox_focus	< 142.0

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2025-68/ https://www.mozilla.org/security/advisories/mfsa2025-69/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=1979499 https://bugzilla.mozilla.org/show_bug.cgi?id=1979804

Frequently Asked Questions

What is CVE-2025-55031? +

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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-55031? +

CVE-2025-55031 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-55031? +

CVE-2025-55031 affects products from mozilla, specifically: firefox, firefox_focus. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-55031? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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