IAM, application owners, and platform teams all share accountability because the control gap exists at the boundary between identity policy and application implementation. Frameworks such as the NIST Cybersecurity Framework 2.0 are useful here because they force ownership across identify, protect, and govern activities.
Why This Matters for Security Teams
Passwordless controls often get treated as a clean replacement for passwords, but the real risk sits in the leftover paths: local fallback accounts, legacy service credentials, recovery flows, and application-specific bypasses. That is where accountability becomes operational, not theoretical. NHI Mgmt Group’s Ultimate Guide to NHIs notes that 96% of organisations store secrets outside secrets managers in vulnerable locations, which is exactly the kind of condition that keeps legacy access alive even after modern authentication is deployed.
Security teams often assume the identity layer has solved the problem once passwordless is enabled, but applications and infrastructure rarely move in lockstep. The result is fragmented ownership: IAM configures policy, application teams preserve compatibility, and platform teams keep systems available. The OWASP Non-Human Identity Top 10 is useful here because it frames exposed credentials and unmanaged access paths as security defects, not just technical debt. In practice, many security teams encounter the accountability gap only after a legacy path is used in production, rather than through intentional control testing.
How It Works in Practice
Accountability should be assigned by control boundary, not by slogan. If a passwordless rollout leaves a legacy API key, shared admin account, or cached token in place, the owner of that residual access path is accountable for remediating it. IAM remains accountable for policy design and assurance, application owners are accountable for removing legacy authentication paths from code and configuration, and platform teams are accountable for the supporting infrastructure that still permits fallback access.
A practical operating model usually includes:
- an inventory of all authentication methods, including fallback and break-glass paths
- clear ownership for each app, service, and environment that can still authenticate without passwordless controls
- rotation or revocation of secrets tied to legacy access path
- control testing that verifies the passwordless path is the only active path for routine access
- exception handling with explicit expiration dates and approval records
This is where NHI governance becomes relevant even in a passwordless discussion. The same residual access problems seen in service accounts and API keys also appear in human-facing systems when organisations do not fully retire old credentials. The 52 NHI Breaches Analysis shows how forgotten or poorly governed access paths repeatedly become entry points. Current guidance suggests mapping these residual paths to formal control owners in line with Ultimate Guide to NHIs standards references and the accountability model in the OWASP Non-Human Identity Top 10.
These controls tend to break down in hybrid environments where SaaS, on-premise applications, and custom integrations each enforce authentication differently because no single team controls the full path end to end.
Common Variations and Edge Cases
Tighter control over legacy access paths often increases operational overhead, requiring organisations to balance safer authentication against compatibility, uptime, and incident response needs. That tradeoff is especially visible during migrations, where a business-critical system may need temporary fallback access while passwordless adoption is incomplete.
There is no universal standard for this yet, but current guidance suggests treating exception paths as time-bound risk decisions rather than permanent architecture. Break-glass accounts, service desk overrides, and vendor-managed access should be separately owned, logged, and reviewed because they can hide outside normal IAM workflows. In regulated environments, that review should be more frequent and evidence-driven, especially when the fallback path touches privileged access or third-party support.
One common edge case is when the application owner cannot fully remove the legacy path because the vendor product hardcodes it. In that case, platform and procurement teams may share remediation responsibility, while security owns the compensating controls and expiry of the exception. Another edge case is partial passwordless adoption, where users authenticate without passwords but downstream systems still rely on long-lived secrets. That creates a false sense of closure unless the secret inventory is also governed. NHI Mgmt Group’s Ultimate Guide to NHIs – Key Challenges and Risks is relevant because it highlights how hidden credentials and poor visibility turn residual access into an ongoing governance issue.
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 CSF 2.0 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | GV.OV-01 | Ownership of residual access paths is a governance and oversight issue. |
| NIST CSF 2.0 | PR.AC-4 | Legacy paths undermine least-privilege access enforcement. |
| OWASP Non-Human Identity Top 10 | NHI-03 | Residual secrets and fallback paths are classic non-human identity control gaps. |
Inventory and retire lingering secrets, then verify every legacy path has an accountable owner.
