Why do passkey import and export flows need stronger controls than traditional credential export?

Passkey portability must preserve security while avoiding file based leakage. Traditional exports can create vulnerable CSV files that are easy to copy, exfiltrate, or store insecurely. A secure transfer model uses local authentication and direct app to app exchange, so no credential file is written to disk. That reduces exposure while still letting users move credentials between managers.

Why Passkey Import and Export Need Stronger Controls

Passkey portability is not just another settings export problem. It moves an authentication secret that can unlock real accounts, so the transfer path has to resist interception, tampering, and accidental disclosure. Unlike a simple preference backup, a passkey transfer can change who can authenticate, which makes the control objective closer to identity assurance than to file portability. That is why secure flows favour local user verification and direct exchange rather than a writable file that can be copied, cached, or forwarded.

Traditional exports often assume the main risk is loss of convenience, but passkeys raise the stakes because a weak transfer process can create a durable credential clone. The OWASP Non-Human Identity Top 10 is not about consumer passkeys specifically, but it illustrates the broader principle that portable credentials need tighter lifecycle controls than ordinary data files. In practice, the question is whether the export process preserves trust without creating a second uncontrolled copy. The 2024 Non-Human Identity Security Report found that 23.7% of organisations still share secrets through insecure methods such as email or messaging applications, which is exactly the sort of leakage channel stronger portability controls are meant to avoid.

In practice, many teams discover the real problem only after a credential transfer has already produced an untracked copy somewhere a file was never meant to live.

How Secure Passkey Transfer Works in Practice

A safer passkey transfer model treats the move itself as a privileged authentication event. The source manager or device first verifies the user locally, then establishes an encrypted, direct relationship with the destination app or device. The credential data is handed off in memory or through a protected system channel, not written to disk as a reusable export file. That removes the most common failure mode of traditional exports: long-lived artefacts that survive beyond the intended transfer window.

There is also a trust-boundary shift. With file export, control often ends once the file is generated. With direct transfer, control has to persist through discovery, pairing, authorisation, and completion. That is why stronger controls are needed: the system must confirm the destination is legitimate, the user is present, and the handoff cannot be replayed or silently redirected. Current guidance suggests that this is closer to secure device migration than to ordinary backup, and the exact implementation may differ across platforms.

Use local authentication before any export can begin, because the transfer itself is the sensitive action.
Prefer app-to-app or device-to-device exchange so no credential file is created for later misuse.
Limit the transfer window and require explicit confirmation of the destination.
Log the event at the identity layer, not as a generic file operation, so the handoff remains auditable.

The NIST SP 800-63 Digital Identity Guidelines are useful here because they frame identity proofing and authenticator handling as assurance problems, while the Ultimate Guide to NHIs — Static vs Dynamic Secrets is a practical reminder that long-lived, reusable secrets create more exposure than short-lived, constrained ones. These controls tend to break down when a platform falls back to file export for compatibility, because the old artefact becomes easier to copy than the new trust model is to enforce.

Common Edge Cases and Control Trade-offs

Tighter transfer controls often reduce portability and increase support complexity, so organisations have to balance user recovery against credential exposure. That trade-off becomes visible when users need to move between ecosystems, recover a lost device, or migrate after an app change. The safest approach is not always the most convenient, and that is acceptable when the object being moved is itself a live authentication factor.

One edge case is cross-platform migration. If the destination cannot verify the source through a secure, interoperable channel, a fallback export may be tempting, but that should be treated as a higher-risk exception rather than a normal workflow. Another edge case is enterprise-managed devices, where policy may need to restrict export entirely or require administrative approval for specific recovery paths. Best practice is evolving here, and there is no universal standard for every ecosystem.

The operational lesson is that a passkey transfer should be assessed by what it could enable if intercepted, not by how often users expect to move it. The transfer is acceptable only when the resulting copy is bounded, authenticated, and difficult to replay. The Guide to the Secret Sprawl Challenge is relevant because the same organisational mistake repeats here: once a secret is allowed to proliferate through weak channels, downstream control becomes much harder. In practice, the hardest failures appear in recovery and migration paths, where convenience pressures are highest and the original security assumptions are easiest to relax.

Risk and Threat Considerations

Passkey import and export flows create a direct credential exposure risk because a successful transfer can produce a usable authentication secret outside the original trust boundary. The main threat is not merely data leakage, but credential duplication, replay, and unauthorised reuse if the transfer artefact or session is intercepted, cached, or redirected.

Failure mechanism: Weak export design allows a credential to be written to a file, copied into unmanaged storage, or handed to the wrong destination without strong user confirmation or device binding. Attackers and opportunistic insiders benefit when the transfer path is easier to abuse than the authenticator itself.

Impact: A compromised transfer can lead to account takeover, long-lived unauthorised access, and loss of trust in recovery workflows, especially when the exported secret remains valid after the initial move.

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, CIS Controls v8, NIST Zero Trust (SP 800-207) and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.

Framework	Control / Reference	Relevance
OWASP Non-Human Identity Top 10	NHI-05 — Secrets and Credential Lifecycle	Passkey transfers are credential lifecycle events that can create duplicate authenticators.
Recommendation — Restrict passkey export paths and require bounded, auditable credential handoff.
NIST SP 800-63	AAL — Authenticator Assurance Level	Passkey transfer strength affects authenticator assurance and replay resistance.
Recommendation — Preserve authenticator assurance by binding transfers to verified user presence and device trust.
CIS Controls v8	6.3 — Require MFA for Externally-Exposed Applications	Secure transfer depends on strong authentication before credential movement occurs.
Recommendation — Enforce strong authentication before allowing any credential export or migration action.
NIST Zero Trust (SP 800-207)	SC-8 — System and Communication Protection	Direct exchange must protect the transfer channel against interception and tampering.
Recommendation — Use protected, mutually authenticated channels for credential handoff instead of writable files.
NIST CSF 2.0	PR.AA — Identity Management, Authentication and Access Control	Passkey portability changes how identities are authenticated and governed.
Recommendation — Apply identity governance controls to every passkey migration and recovery flow.

Practitioner Guidance

What to verify: Treat export as a high-risk authentication event, not a convenience feature. Verify that the destination is explicitly bound to the session, that the user is locally authenticated at the moment of transfer, and that no persistent file or clipboard artefact is left behind.

Decision rule: If a workflow requires writing the credential to disk to complete the move, treat it as an exception path and require compensating controls such as time limits, explicit user confirmation, and post-transfer revocation checks. If the platform can support direct app-to-app exchange, prefer that path and reserve file-based export for narrowly defined recovery cases.

What good looks like: The transfer is short-lived, user-present, destination-verified, and auditable, with no reusable export object available after completion.

Practitioner takeaway: The key control question is not whether users can move passkeys, but whether the move can happen without creating a second, less-governed copy that outlives the original security boundary.