Accountability sits with the identity owner and the application owner together, because the risk comes from a governance gap across both layers. If a fallback method remains enabled, the programme has not completed the control change. That should be tracked as an access governance exception until the weaker path is removed.
Why This Matters for Security Teams
When passwordless rollout leaves backup login methods enabled, the issue is not just convenience or user experience. It is a control-state problem: the organisation has introduced a stronger primary path while preserving a weaker secondary path that attackers can target. That means the real risk sits at the boundary between identity governance and application ownership, where exceptions are often assumed rather than tracked. The NIST Cybersecurity Framework 2.0 is clear that access control changes need ownership, monitoring, and lifecycle management, not just technical rollout.
For security teams, the practical concern is that backup methods tend to survive migrations: SMS, email reset, shared recovery codes, old MFA factors, and dormant helpdesk flows. Each one becomes a residual authentication path that can bypass the intended assurance level. NHI Management Group has repeatedly shown in its coverage of the DeepSeek breach and related secret exposure research that abandoned or overlooked access paths are exactly where governance failures become exploitable. In practice, many security teams encounter the weak backup path only after an incident review, rather than through intentional exception management.
How It Works in Practice
Accountability should be shared, but not diluted. The identity owner is responsible for the authentication policy, assurance level, and deprecation of legacy methods. The application owner is responsible for ensuring the application no longer depends on fallback login for business continuity, admin recovery, or customer support workflows. If either side treats the rollout as complete before backup methods are removed, the control change is unfinished.
A workable process usually includes four steps:
- Inventory every enabled login and recovery method, including helpdesk-assisted resets and legacy federation paths.
- Assign a named control owner for each method, with a target retirement date and exception record.
- Verify that passwordless is enforced for primary access and that backup paths are either removed or constrained to tightly scoped recovery scenarios.
- Continuously test the residual paths with monitoring, audit logging, and periodic access reviews.
This is where current guidance suggests using formal exception tracking rather than informal remediation notes. If a weaker method must remain temporarily, the exception should document why, who approved it, how long it may exist, and what compensating controls apply. That aligns with the NIST Cybersecurity Framework 2.0 emphasis on governed access control rather than one-time hardening. The operational lesson is that passwordless is not fully deployed until every alternate path has been either eliminated or reduced to a reviewed, time-bound recovery process.
These controls tend to break down in large estates with multiple identity providers, custom apps, and outsourced support desks because backup methods are often embedded in separate ownership chains.
Common Variations and Edge Cases
Tighter control over backup login methods often increases operational friction, so organisations have to balance stronger assurance against recovery speed and support burden. That tradeoff is real, especially where executives, regulated users, or critical service operators need break-glass access.
There is no universal standard for this yet, but current guidance generally treats the following as high-risk patterns: SMS as a fallback for privileged accounts, shared recovery addresses, static backup codes stored insecurely, and helpdesk resets that do not require strong proofing. In those cases, the passwordless programme may be technically live while governance remains incomplete.
For mature environments, the safest pattern is to narrow fallback use to exceptional recovery only, then wrap it in logging, approval, and expiry. NHI Management Group’s coverage of secrets exposure in The State of Secrets in AppSec reinforces the same principle: residual access paths stay dangerous when they are left in place without a clear owner and retirement plan. In edge cases such as customer-facing SaaS or hybrid identity estates, the backlog is often not technical impossibility but ownership ambiguity across identity, application, and support teams.
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 AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | PR.AC-4 | Directly applies to managing and reviewing access pathways and exceptions. |
| OWASP Non-Human Identity Top 10 | NHI-03 | Covers weak or residual credentials and fallback access that persists after rollout. |
| NIST AI RMF | Supports governance accountability for access decisions in complex identity workflows. |
Use AI RMF governance practices to define accountable owners, exceptions, and review cadence for access changes.
Related resources from NHI Mgmt Group
- Who is accountable when automated deprovisioning does not happen after access review?
- Who is accountable when an AI-enabled espionage campaign uses internal credentials?
- Who is accountable when suspicious activity is discovered after deposits have already been accepted?
- Who is accountable when a former employee still has access after offboarding?
