Security teams should treat passkeys as the stronger default for most sign-ins because they remove the password and the extra code step that can be phished, intercepted, or replayed. Traditional 2FA still helps protect password-based accounts, but it remains vulnerable to social engineering and token theft. Use 2FA as a control layer where passwords remain necessary, and reserve it for especially sensitive access paths.
Why the Better Choice Depends on the Sign-in Path
Passkeys and traditional two-factor authentication solve different problems. Passkeys change the sign-in model by replacing passwords with a phishing-resistant cryptographic credential, so the common theft path is removed rather than merely hardened. Traditional 2FA is still useful when passwords remain in play, but its protection quality varies by factor type, recovery process, and whether the factor can be socially engineered or replayed.
For security teams, the key decision is not which control sounds stronger in theory, but which control matches the authentication architecture in front of the user. A passwordless flow with passkeys reduces the attack surface of password reuse, phishing, and password reset abuse. A password-plus-2FA flow still leaves the password as a valuable target and makes the second factor an additional barrier, not a complete redesign of the sign-in path.
What Passkeys Change Operationally
Passkeys are strongest when the goal is to make routine sign-ins resistant to phishing and credential replay. Because the private key stays on the authenticator and the user is not typing a shared secret into a site, attackers lose the easiest way to harvest reusable credentials. That is why passkeys are often the better default for workforce and customer authentication where platform support and recovery design are mature.
The practical trade-off is that passkeys shift risk into enrollment, device loss, sync, and recovery handling. If recovery is weak, a phishing-resistant primary factor can still be undermined by help desk manipulation or fallback paths that quietly reintroduce passwords and one-time codes. Security teams should therefore evaluate passkeys as a system change, not just a new login button. Passwordless and Passkeys Guide explains the sign-in model, rollout, and recovery implications in more detail.
Where Traditional 2FA Still Belongs
Traditional 2FA still has a role when passwords cannot be eliminated, when legacy applications are hard to modernize, or when a sensitive action needs an extra verification step beyond normal sign-in. In those cases, 2FA can reduce the success rate of simple password compromise and credential stuffing, especially when the second factor is resistant to interception and prompt fatigue.
The limitation is that not all 2FA is equal. SMS and some push-based approaches are exposed to phishing, social engineering, SIM swap, or approval fatigue, while token theft and session hijacking can bypass a successful challenge after the fact. For that reason, teams should avoid treating “MFA enabled” as a final state. The relevant question is whether the factor meaningfully resists the attack paths most likely to be used against that account class. Workforce Identity Security Guide covers phishing-resistant MFA, passkeys, and account recovery considerations together, which is useful when the sign-in path is still mixed.
How to Set a Practical Policy
A sensible policy is to make passkeys the default for new deployments and for any population that can support them without creating brittle fallback flows. Keep traditional 2FA as a transitional or compensating control where passwords must remain, where regulatory or application constraints block passwordless adoption, or where step-up verification is needed for high-risk actions.
Security teams should also separate sign-in assurance from privilege management. Strong authentication does not remove the need for tight recovery, session controls, and access limitation on sensitive accounts. If the account can trigger financial, administrative, or production-impacting actions, the better control decision may be to combine passkeys with stricter authorization and session governance rather than to choose between passkeys and 2FA as if they were interchangeable. NIST SP 800-63 Digital Identity Guidelines are the most useful external reference for thinking about assurance levels and phishing-resistant authenticators.
Risk and Threat Considerations
The main risk is assuming that any second factor is enough. Attackers increasingly target the weakest adjacent path, such as password reset, help desk verification, session theft, or a fallback method that bypasses the stronger authenticator. A passkey program can still fail if recovery channels are weaker than the primary sign-in flow, while traditional 2FA can fail if the factor is phishable or replayable.
Failure mechanism: The control breaks when the attacker can either steal the password, coerce the second factor, or hijack the authenticated session after login, which is why “2FA enabled” is not equivalent to phishing resistance.
Impact: Account takeover can lead to mail access, privilege escalation, data exposure, fraudulent approvals, or lateral movement into higher-value systems, especially when the compromised account is used for administrative or support functions.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-63, NIST SP 800-53 Rev 5 and CIS Controls v8 set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-63 | Digital Identity Guidelines | Defines assurance and phishing-resistant authenticators for sign-in decisions. |
| Recommendation — Use phishing-resistant authenticators and recovery paths that match the required assurance level. | ||
| NIST SP 800-53 Rev 5 | IA-2 — Identification and Authentication (Organizational Users) | Applies because workforce sign-in protection depends on strong user authentication. |
| IA-5 — Authenticator Management | Applies to password, token, and authenticator lifecycle choices that shape account protection. | |
| Recommendation — Enforce strong authentication for organizational accounts and restrict weaker fallback paths. Manage authenticators so weak recovery and reusable credentials do not undermine sign-in security. | ||
| CIS Controls v8 | CIS-5 — Account Management | Supports account access decisions, especially recovery and privileged account handling. |
| Recommendation — Standardize account recovery and access governance to reduce takeover opportunities. | ||
| ISO/IEC 27001:2022 | A.5.16 — Identity management | Relevant to managing identities and authentication methods across the account lifecycle. |
| Recommendation — Define identity lifecycle rules that match authentication strength to account risk. | ||
Practitioner Guidance
What to verify: Treat recovery paths, not just the primary sign-in method, as the real control boundary. If a user can be reset back to password plus OTP with minimal verification, the deployment still carries the same phishing and social-engineering exposure you were trying to remove.
Decision rule: If the application and user population can support a passwordless flow end to end, prefer passkeys. If a password must remain, use the strongest feasible 2FA method as a bridge, but require step-up controls for privileged actions and sensitive support workflows.
Practitioner takeaway: Choose the factor that removes the attacker’s cheapest path first; if passwords and weak recovery still exist, 2FA is a mitigation layer, not a substitute for phishing-resistant authentication.
Related resources from NHI Mgmt Group
- What is the difference between hardware-backed security keys and ordinary multi-factor authentication for account protection?
- How should security teams decide when two-factor authentication is strong enough for sensitive systems?
- How should security teams decide between a PIN and a password for authentication?
- How should security teams decide between certificate-based authentication and MFA?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 26, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
