They create less value when the fallback path is weak, when unmanaged devices can enrol, or when the same authenticator is allowed to cover every account type. In those cases, the authentication surface shrinks at login but expands in recovery and exception handling. Teams should evaluate the entire identity journey, not just the sign-in screen.
Why This Matters for Security Teams
Passkeys can reduce password phishing, but they do not automatically reduce identity risk across the full journey. The biggest mistake is treating login as the whole control plane. If recovery still accepts weak proofing, if unmanaged endpoints can register authenticators, or if one passkey can unlock too many account types, the attack surface simply shifts. That is why the broader NHI problem set in the Top 10 NHI Issues matters: credential strength at the front door means little if exception paths stay soft.
Current guidance from NIST Cybersecurity Framework 2.0 still points teams toward identity, recovery, and access governance as linked functions, not isolated events. For organisations managing why NHI security matters now, the lesson is the same: stronger authentication only helps when the surrounding policy, recovery, and device trust decisions are equally strong. In practice, many security teams discover passkey weakness only after recovery abuse, not through a clean sign-in failure.
How It Works in Practice
Teams should evaluate passkeys as one control inside a broader identity workflow. The practical question is not “Can an attacker phish the login?” but “What else can they reach once one factor is accepted?” A passkey can be strong and still deliver poor risk reduction if account recovery, device enrolment, delegated admin, or shared authenticator patterns are weak. That is especially true in mixed environments where human accounts, service workflows, and privileged access paths intersect.
A useful operating model is to map each stage of the identity lifecycle and test where passkey assurance drops off:
- registration: can any device enrol, or only trusted managed devices?
- recovery: is there stronger proofing than the sign-in flow itself?
- session elevation: does the same authenticator unlock privileged actions?
- account scope: does one passkey cover consumer, workforce, and admin roles?
- fallback: are SMS, email, or help desk resets weaker than the primary method?
That model aligns with the OWASP NHI Top 10 emphasis on identity boundary failures, where controls degrade outside the primary authentication flow. It also fits NIST Cybersecurity Framework 2.0, which treats access, recovery, and governance as connected risk decisions. Where possible, bind passkeys to device trust, require step-up checks for recovery, and separate privileged account enrollment from ordinary user enrollment. These controls tend to break down in bring-your-own-device environments with weak endpoint management because the enrolment path becomes the easiest path.
Common Variations and Edge Cases
Tighter passkey policy often increases user friction and help desk load, requiring organisations to balance phishing resistance against recovery usability. That tradeoff is real, and best practice is still evolving for high-assurance environments. Current guidance suggests that the strongest design is not “passkey everywhere” but “passkey plus constrained fallback.”
Some environments need special handling. Shared workstations, contractor access, regulated admin accounts, and hybrid consumer-workforce identity stacks often need separate policies because one authenticator model does not fit every risk tier. If a passkey is allowed to replace all other assurance methods, then recovery becomes the weakest link. If recovery is too strict, users and administrators create shadow processes that bypass policy. The right balance is usually a step-up model: strong passkeys for sign-in, separate proofing for account reset, and policy exceptions only for explicitly approved high-risk workflows.
For organisations focused on NHI and broader identity governance, the same pattern shows up elsewhere: control strength at one point does not compensate for weak lifecycle management elsewhere, as outlined in the Ultimate Guide to NHIs – Key Challenges and Risks. The practical rule is simple: if the fallback path is easier to abuse than the passkey is to bypass, the net risk reduction will be smaller than expected.
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 CSF 2.0 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AA-01 | Identity assurance must cover recovery and enrolment, not just sign-in. |
| OWASP Non-Human Identity Top 10 | NHI-01 | Weak fallback paths and overbroad authenticator scope create identity exposure. |
| NIST AI RMF | Risk governance is needed when assurance varies across the identity lifecycle. |
Review identity assurance across login, recovery, and enrolment, then close the weakest path first.
