They sometimes treat passkeys as a narrow login upgrade instead of an assurance model. Passkeys reduce phishing risk substantially, but only if the surrounding lifecycle, recovery, and privileged workflows do not recreate weaker forms of trust. The control is strongest when it is consistent across the full identity journey.
Why This Matters for Security Teams
Passkeys and FIDO2 are often sold as a simple phishing fix, but that framing is too narrow for enterprise identity. They are really part of an assurance model: how the organisation proves a user, device, and session are trustworthy at each step. If security teams focus only on login, they can leave recovery, device change, step-up authentication, and privileged actions exposed to weaker trust paths. NIST’s NIST SP 800-63 Digital Identity Guidelines treat authenticator strength as only one part of identity assurance, not the whole control.
This matters because attackers rarely stop at the first checkpoint. They target help desks, account recovery, or fallback MFA to recreate access where passkeys are absent or inconsistently enforced. That same pattern appears in broader identity security research from Ultimate Guide to NHIs, which shows how weak lifecycle controls and over-permissive access turn a strong credential into a fragile control plane. In practice, many security teams discover the gap only after a recovery workflow or privileged exception has already been abused.
How It Works in Practice
FIDO2 gives strong cryptographic proof of possession, and passkeys improve usability by reducing password dependence. The real implementation question is whether the enterprise extends that strength across enrollment, recovery, and admin workflows. A passkey cannot compensate for weak identity proofing during registration, broad self-service recovery, or inconsistent step-up checks for sensitive actions. That is why current guidance suggests treating FIDO2 as one layer in a full identity assurance journey, not as a universal replacement for every authentication and authorisation decision.
Security teams generally get better results when they design around these operational patterns:
- Use phishing-resistant authentication for primary sign-in and privileged access, not just for standard users.
- Require strong identity proofing before passkey enrollment and before adding a new authenticator.
- Harden account recovery with separate controls, manual review, or high-assurance step-up.
- Bind higher-risk actions to fresh authentication, not only to the initial session.
- Monitor device lifecycle events so lost, replaced, or unmanaged devices do not become fallback paths.
These controls align well with the identity assurance concepts in NIST SP 800-63 Digital Identity Guidelines and the broader lifecycle emphasis in Ultimate Guide to NHIs, even though the underlying identity type is different. The operational lesson is the same: strong authenticators lose value when recovery, enrollment, and exception handling are easier to abuse than the original login. These controls tend to break down in large organisations with outsourced service desks and fragmented legacy apps because fallback paths become inconsistent.
Common Variations and Edge Cases
Tighter passkey enforcement often increases support overhead, requiring organisations to balance phishing resistance against usability, device loss, and recovery complexity. There is no universal standard for every edge case yet, especially where legacy apps, shared workstations, or regulated break-glass access are involved.
One common mistake is assuming all users can be moved to passkeys on the same timeline. High-risk groups such as administrators, finance approvers, and developers often need different enrollment rules, stronger recovery gates, and clearer session controls. Another edge case is cross-device passkey use, which can improve resilience but may also create policy ambiguity if the organisation does not define what devices are trusted and how they are verified.
Security teams should also distinguish between authentication strength and privilege design. Passkeys do not fix overbroad authorisation, so privileged workflows still need least privilege, session monitoring, and just-in-time elevation where possible. The most reliable programs treat passkeys as a durable foundation and then remove fallback mechanisms that silently recreate password-era risk.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST SP 800-63 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-63 | SP 800-63B | Defines authenticator assurance, enrollment, and recovery expectations for passkey use. |
| NIST CSF 2.0 | PR.AA-1 | Identity and authentication controls must cover more than the login event. |
| OWASP Non-Human Identity Top 10 | NHI-01 | Highlights lifecycle and trust-path weaknesses that also affect identity security design. |
Apply phishing-resistant authenticators, strong proofing, and secure recovery across the full identity lifecycle.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on July 4, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
