Why do weak passwords still matter if an organisation is moving to passkeys?

Why This Matters for Security Teams

Passkeys remove the password as a primary phishing target, but most organisations are not passkey-only yet. Legacy login paths, helpdesk recovery, shared admin access, and external integrations still create exposure where weak or reused passwords can be attacked. The real risk is not the passkey itself, but the long tail of mixed authentication that remains active during migration.

That matters because attackers rarely need to break the strongest control if they can exploit the weakest path in the estate. Credential stuffing, password spraying, and account recovery abuse still work wherever passwords, fallback MFA, or manually managed accounts remain. NHI Management Group’s Ultimate Guide to NHIs shows that 79% of organisations have experienced secrets leaks, with 77% of those incidents causing tangible damage, which is a useful reminder that old credential habits persist long after a new control is introduced.

Current guidance from the NIST Cybersecurity Framework 2.0 still assumes organisations must manage identity risk across the full lifecycle, not just at the point of sign-in. In practice, many security teams discover weak-password exposure only after a fallback path, recovery flow, or rarely used service account has already been abused.

How It Works in Practice

Passkeys improve authentication by replacing reusable shared secrets with cryptographic proof tied to a device or authenticator. That change sharply reduces phishing and credential replay, but it does not automatically clean up the rest of the identity estate. Security teams still need to inventory where passwords remain accepted, identify accounts that can be recovered through weaker methods, and remove informal access patterns that bypass modern authentication.

In mixed environments, the practical control set usually includes:

• Finding every password-based path, including legacy apps, admin consoles, break-glass access, and SSO bypass routes.
• Requiring strong unique passwords where passkeys are not yet supported, with enforced rotation only where risk justifies it.
• Hardening account recovery, since recovery is often the real weakest link during migration.
• Reducing shared credentials and replacing them with named accounts plus role-based or just-in-time access.
• Monitoring for password spraying, reuse, and anomalous recovery events across both human and non-human identities.

This is especially important where passwords are still used by service accounts, API keys, or scripts. The same mixed-estate problem appears in NHI governance: the Ultimate Guide to NHIs notes that 96% of organisations store secrets outside secrets managers in vulnerable locations, which shows how often “temporary” exceptions become permanent exposure. Passkeys help at the human login layer, while broader identity hygiene reduces what attackers can do after they get in.

The control model aligns with the preventive and detection guidance in NIST Cybersecurity Framework 2.0, especially around access management, anomaly detection, and recovery path hardening. These controls tend to break down in environments with multiple legacy directories, externally hosted SaaS tools, and unmanaged local admin accounts because password acceptance remains distributed and hard to fully retire.

Common Variations and Edge Cases

Tighter authentication often increases operational friction, requiring organisations to balance user convenience against residual legacy risk. That tradeoff is real during passkey rollout, especially when business units rely on old applications or when frontline workers cannot be forced onto a single authenticator overnight.

Best practice is evolving, but current guidance suggests three common edge cases deserve separate treatment. First, break-glass accounts should be rare, tightly monitored, and isolated from everyday login flows. Second, service accounts should not be treated like user accounts; they need secret rotation, vaulting, and ownership because passkeys do not solve machine-to-machine authentication. Third, account recovery should be redesigned before passwords are removed, since insecure recovery can reintroduce the same weak-secret problem through a side door.

For organisations with high secret exposure, the question is not whether passkeys are worthwhile but whether the remaining password surface is visible and governed. NHI Management Group research shows only 5.7% of organisations have full visibility into service accounts, which is why hidden credentials often persist after a “passwordless” announcement. The weak-password problem does not disappear when passkeys are adopted; it shifts to the places the rollout missed, and those gaps are usually found in the least monitored workflows.

Related resources from NHI Mgmt Group

• Why do ephemeral credentials still leave risk in machine access models?
• Why do reused passwords still matter in modern IAM programmes?
• Why do passkeys matter even when users still need fallback authentication?
• Why do stolen passwords still matter so much in ransomware attacks?