What breaks when device onboarding still relies on passwords?

Password-based device onboarding creates shared secrets, slow revocation, and weak accountability. It also makes large fleets hard to audit because the secret, not the device lifecycle, becomes the control point. Standardised, revocable onboarding avoids that problem by tying trust to the device identity rather than to an embedded password.

Why This Matters for Security Teams

When device onboarding still depends on a shared password, the control point becomes a secret that can be copied, reused, embedded, or leaked instead of the device lifecycle itself. That breaks revocation, obscures provenance, and makes it difficult to prove which device enrolled, when, and under what trust conditions. NHI Management Group’s Ultimate Guide to NHIs notes that only 20% of organisations have formal offboarding and API key revocation processes, which is a strong signal that lifecycle controls are already weak before onboarding is even considered.

For security teams, the practical issue is not just weak authentication. Password-based onboarding creates a durable shared secret that can outlive the device, survive reassignment, and remain valid after compromise. That conflicts with modern identity guidance such as the NIST Cybersecurity Framework 2.0, which pushes organisations toward stronger identity assurance, continuous governance, and repeatable control outcomes. In large fleets, that mismatch becomes operational debt fast.

In practice, many security teams discover the weakness only after a password has been copied into a script, a config file, or a provisioning image and then reused across devices.

How It Works in Practice

Password-based onboarding usually means the first trust decision is made with a reusable secret rather than with device identity. That might be a shared bootstrap password, a factory default credential, or an enrolment token that is treated like a password. Once that pattern exists, every downstream control inherits its weakness: rotation is slower, audit trails are less reliable, and revocation becomes ambiguous because the same secret may be embedded in multiple places.

Better practice is to bind onboarding to the device itself. Current guidance suggests using a unique, revocable bootstrap credential or certificate per device, then exchanging that for a short-lived identity token or certificate after attestation or approval. That is materially different from static secret reuse. It aligns onboarding with lifecycle state, so the device can be authenticated, logged, and offboarded as a distinct workload identity rather than as a holder of a shared password. For teams managing large fleets, the Ultimate Guide to NHIs is useful here because it frames identity governance around visibility, rotation, and revocation instead of around secret storage.

• Issue unique onboarding credentials per device, not one password for a class of devices.
• Prefer short-lived bootstrap trust and immediate replacement with a device certificate or token.
• Record onboarding events against device identity, owner, model, and lifecycle stage.
• Automate revocation when a device is retired, reimaged, lost, or repurposed.
• Use policy and attestation checks so onboarding is conditional, not unconditional.

This approach also improves accountability because the trust decision can be tied to a specific device instance, not to a password that may have been copied into build tooling or shared between operators. These controls tend to break down when legacy firmware only supports static credentials because the onboarding process cannot be converted without a hardware or platform refresh.

Common Variations and Edge Cases

Tighter onboarding controls often increase operational overhead, requiring organisations to balance stronger device assurance against provisioning speed and support burden. That tradeoff is real in mixed estates, especially where some devices support certificates, some only support passwords, and some cannot be updated without downtime.

There is no universal standard for every device class, but the direction is clear: the more autonomous or remotely managed the fleet, the less defensible password onboarding becomes. In constrained environments, a temporary password may still be used as a one-time bootstrap step, but best practice is evolving toward immediate replacement with a unique device credential. That matters because password onboarding creates hidden coupling between manufacturing, logistics, and operations, while device identity should remain stable even as secrets change.

For broader NHI governance, this is also where weak onboarding tends to cascade into excessive privilege and poor offboarding. NHI Mgmt Group’s research shows that NHIs outnumber human identities by 25x to 50x, so a single flawed onboarding pattern can scale into a fleet-wide exposure quickly. In practice, that problem is usually uncovered during incident response or fleet cleanup, not during design review.

Related resources from NHI Mgmt Group

• What breaks when a BYOC model still relies on standing vendor access?
• What breaks when authentication services are reused across connected and isolated environments?
• What breaks when OT teams keep using permanent privileged accounts?
• What breaks when perimeter security is treated as the main trust control?