Passwordless authentication is safer, but only with complete rollout

At a glance

What this is: This is Axiad’s analysis of passwordless authentication, arguing that it improves security over passwords but remains vulnerable when deployment is partial or poorly governed.

Why it matters: It matters because IAM teams still have to govern device trust, recovery paths, and privileged access even when passwords are removed from the login flow.

By the numbers:

• 79% of organisations have experienced secrets leaks, with 77% of these incidents resulting in tangible damage.
• Only 5.7% of organisations have full visibility into their service accounts.
• 97% of NHIs carry excessive privileges, increasing unauthorised access and broadening the attack surface.

👉 Read Axiad's analysis of whether passwordless authentication is safe

Context

Passwordless authentication removes passwords from the user login flow, but it does not remove identity risk. The security question shifts from password hygiene to device trust, biometric assurance, recovery controls, and whether the whole authentication path is governed consistently.

For IAM and security teams, the key issue is that partial deployment creates new weak points. If passwordless is only applied to some applications, or if device enrollment and fallback paths are weak, organisations can trade password exposure for fragmented identity assurance instead of reducing risk overall.

Key questions

Q: What breaks when passwordless authentication is only partially deployed?

A: Partial deployment creates identity fragmentation. If some applications, users, or recovery flows still depend on passwords, attackers will target those exceptions because they are usually governed less consistently than the primary passwordless path. The result is not a secure hybrid model, but a mixed assurance environment with uneven policy enforcement.

Q: Why does passwordless authentication still need strong IAM governance?

A: Passwordless removes passwords, but it does not remove identity assurance, recovery, or privilege management. IAM governance is still needed to control device enrolment, credential issuance, fallback resets, and admin access. Without those controls, organisations can reduce password risk while leaving the broader authentication system exposed.

Q: How can security teams tell whether passwordless is actually safer?

A: Look for consistency, not just adoption. Passwordless is working when fallback paths are rare, recovery is tightly controlled, device binding is enforced, and users are not silently reverting to weaker methods. If exceptions are common, the programme may look modern while still carrying the same operational risk.

Q: Who is accountable when passwordless access fails?

A: Accountability usually sits with identity, security, and platform owners together. The failure often spans enrollment, device management, help desk recovery, and application policy, so no single team can own it alone. Organisations should define who approves exceptions, who revokes access, and who audits the full authentication lifecycle.

Technical breakdown

Why passwordless still depends on trusted identity proofing

Passwordless authentication replaces knowledge factors with possession or inherence factors, such as a managed device, keycard, security key, or biometric scan. That shifts the attack surface rather than eliminating it. If the underlying identity proofing, device registration, or recovery process is weak, an attacker can still gain access by hijacking the trusted device or abusing fallback enrolment. The control problem is not the absence of passwords alone. It is whether every credential issuance and recovery path remains bound to strong identity assurance and policy enforcement.

Practical implication: review enrollment, recovery, and fallback paths with the same scrutiny you would apply to privileged credential issuance.

Partial rollout creates authentication gaps

A passwordless programme only improves security when it is applied consistently across the environment. Mixed states are common during migration, but they can create shadow paths where some users, applications, or workflows still rely on passwords or weaker recovery methods. Those exceptions become the easiest route for attackers because policy is no longer uniform. In practice, the biggest weakness is often not the passwordless method itself, but the boundary between new and old authentication models.

Practical implication: map every remaining password-based or fallback path before declaring the rollout complete.

Why PKI matters in passwordless architecture

Public key infrastructure supports passwordless by issuing signed credentials that can be verified without exposing shared secrets in transit. That gives the organisation a stronger cryptographic trust model than reusable passwords. But PKI only improves security when certificate issuance, revocation, renewal, and device binding are governed tightly. If those lifecycle controls are weak, the organisation simply replaces one kind of credential risk with another, especially when devices are lost, replaced, or shared.

Practical implication: align certificate lifecycle management with the same governance model used for other high-value identities.

Threat narrative

Attacker objective: The attacker wants to bypass user authentication by abusing the weakest trusted factor, recovery path, or rollout gap.

1. Entry begins when an attacker targets the trusted device, biometric factor, or fallback path used for passwordless access, rather than the password itself.
2. Escalation occurs if the organisation relies on weak recovery processes, incomplete rollout, or unmanaged insider access that allows misuse of the trusted authentication path.
3. Impact is unauthorised access to user data and business systems even though passwords were removed from the primary login flow.

Breaches seen in the wild

• Cisco DevHub NHI breach — IntelBroker exploited exposed Cisco credentials, API tokens and keys in DevHub.
• DeepSeek breach — DeepSeek breach exposed 1M+ log lines and sensitive secret keys.

Read our 52 NHI Breaches Analysis report for a comprehensive view of breaches impacting Non-Human Identities including AI Agents.

NHI Mgmt Group analysis

Passwordless authentication reduces one compromise path, but it does not solve identity governance by itself. Removing passwords eliminates a familiar weak factor, yet the organisation still has to govern device trust, recovery, certificate lifecycle, and administrative access. The practical conclusion is that passwordless is a control change, not a control substitute.

Partial passwordless rollout creates an assurance gap that attackers can route around. Mixed authentication states leave exceptions in enrollment, fallback, and application access. Those exceptions matter because identity assurance is only as strong as the weakest path into the programme.

PKI-based passwordless works best when certificate lifecycle and device binding are treated as identity controls. Signed credentials are stronger than reusable secrets, but only if issuance, renewal, revocation, and replacement are tightly managed. The practitioner implication is that passwordless security depends on identity operations, not just login UX.

Human identity programmes and NHI governance are converging on the same lesson: trust is a lifecycle problem. Whether the subject is a user device, a service account, or a certificate, the core risk is unmanaged trust persistence. That makes lifecycle discipline the real differentiator, not the authentication label attached to the control.

From our research:

• 91.6% of secrets remain valid five days after the targeted organisation is notified, showing a critical gap in remediation procedures, according to Ultimate Guide to NHIs.
• 71% of NHIs are not rotated within recommended time frames, increasing the risk of compromise over time, according to NHI Mgmt Group research.
• For lifecycle and offboarding detail, see 52 NHI Breaches Analysis, which shows how weak revocation turns exposure into lasting access.

What this signals

Complete authentication is now a lifecycle problem, not just a login problem. Passwordless programmes will only reduce risk if they close recovery, enrolment, and device retirement gaps at the same pace as rollout. That makes identity operations and endpoint governance inseparable in practice.

The governance pattern is familiar across human, workload, and delegated access: remove one credential type and the residual paths become more visible. Organisations that treat passwordless as a UX improvement will miss the real issue, which is assurance continuity across every fallback state.

Passwordless trust debt: every exception, fallback, and legacy dependency becomes deferred risk until the programme is fully standardised. Teams should expect this debt to show up first in help desk resets, shared devices, and privileged workflows.

For practitioners

• Inventory every fallback authentication path Map biometric recovery, help desk reset, legacy password exceptions, and device replacement flows. Any path that bypasses the primary passwordless control should be treated as a high-value access route and reviewed before full rollout.
• Bind passwordless access to managed devices and certificate lifecycle Use PKI or equivalent cryptographic binding where possible, then track issuance, renewal, revocation, and device retirement as part of identity governance rather than endpoint cleanup.
• Test partial deployment as an attack path Run tabletop scenarios that assume one application, one user group, or one recovery flow remains password-based. Validate whether the exception can be exploited to enter broader systems.
• Review privileged and third-party access separately Passwordless for employees does not automatically secure admin and vendor access. Recheck privileged workflows, contractor access, and shared support accounts for weaker authentication and recovery rules.

Key takeaways

• Passwordless authentication improves security only when the entire identity path is governed, including enrollment, fallback, and recovery.
• Partial rollout can leave weaker access routes in place, creating assurance gaps that attackers can exploit.
• PKI and device binding strengthen passwordless deployments, but only when lifecycle controls are enforced as identity controls.

Key terms

• Passwordless Authentication: A login method that verifies a user without requiring a memorised password. It usually relies on a trusted device, biometrics, or cryptographic credentials. The security outcome depends on how strongly the identity proofing, recovery, and device-binding steps are governed.
• Certificate Lifecycle: The process of issuing, renewing, revoking, and retiring certificates that underpin trust in digital identities. In passwordless environments, lifecycle control is central because a strong credential can still become a risk if it is not rotated, revoked, or bound to the right device.
• Fallback Path: Any alternate authentication route used when the primary control cannot complete, such as recovery codes, help desk resets, or legacy password access. Fallback paths often become the weakest part of a passwordless programme because they are less visible and less consistently enforced.
• Device Binding: A control that ties authentication to a known and managed device rather than to a shared secret. It strengthens passwordless access by making credential use dependent on the trustworthiness of the endpoint, but it only works if device enrollment and retirement are also governed tightly.

Deepen your knowledge

NHI governance, agentic AI identity, and machine identity lifecycle are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are responsible for identity security strategy or NHI governance in your organisation, it is worth exploring.

This post draws on content published by Axiad: Is Passwordless Authentication Safe? Read the original.