Start with continuous discovery, not periodic cleanup. Correlate application inventories, authentication logs, configuration data, and code repositories to find credentials stored outside the directory. Then tie each account to an owner and a lifecycle state. If an identity cannot be traced to a responsible system or person, it should be treated as an unmanaged exposure until proven otherwise.
Why This Matters for Security Teams
Orphaned and local accounts are dangerous because they bypass the central identity controls that teams rely on for visibility, review, and offboarding. When an account lives only inside an application, database, CI/CD pipeline, or server OS, it often escapes joiner-mover-leaver workflows and never gets tied back to an owner. That creates hidden standing access, weak accountability, and a long tail of credential sprawl. NHI Management Group’s Ultimate Guide to NHIs — Key Challenges and Risks notes that only 5.7% of organisations have full visibility into their service accounts, which is why discovery has to be continuous rather than reactive.
This is not just an inventory problem. Local accounts are often created to solve operational shortcuts, emergency access, vendor integration, or legacy migration gaps, then left behind when the original context disappears. Security teams that wait for periodic cleanup usually find these identities only after a breach review, a failed audit, or an unexplained privilege path. Current guidance suggests treating any untraceable account as unmanaged until evidence proves otherwise, especially where NIST SP 800-53 Rev. 5 Security and Privacy Controls would expect accountable access control, logging, and review.
How It Works in Practice
Effective discovery starts by correlating multiple evidence sources instead of relying on one system of record. The goal is to identify accounts that exist outside the directory, then determine whether they are active, owned, and still required. In practice, teams usually combine application inventories, host and database configuration, authentication logs, secret scanning, and code repository searches to locate credentials that were embedded in scripts, config files, or automation jobs.
The most useful approach is to treat discovery as a lifecycle control, not a one-time scan. The NHI Lifecycle Management Guide frames this as a sequence: find, classify, assign ownership, validate usage, and retire what is no longer needed. That means each discovered account should be tagged with at least four attributes: where it was found, what system uses it, who approved it, and when it was last verified. If the answer to any of those is missing, the account should remain under review.
- Search for local admins, service accounts, API users, and embedded credentials in code, configs, and secrets stores.
- Correlate last-login data with deployment records to separate active automation from stale leftovers.
- Match each account to an owner, system, and ticket or change record.
- Flag accounts with no owner, no usage, or no documented purpose for containment.
Security teams also need to distinguish between valid local necessity and avoidable duplication. Some applications require local accounts for resilience, offline operation, or vendor-managed support paths. Others only keep them because migration was incomplete. In those cases, the right answer is usually to convert to centrally managed identity, rotate the associated secret, and then retire the local credential. The visibility gap is broader than most teams expect: NHI Management Group reports that 96% of organisations store secrets outside secrets managers in vulnerable locations including code, config files, and CI/CD tools.
These controls tend to break down in legacy estates with fragmented authentication, undocumented admin access, or applications that cannot emit reliable audit logs.
Common Variations and Edge Cases
Tighter discovery usually increases operational overhead, requiring organisations to balance completeness against change risk and legacy system fragility. That tradeoff matters because some environments cannot be scanned or remediated aggressively without disrupting production or vendor support. Best practice is evolving, but current guidance suggests using risk-based prioritisation when a full estate sweep is not immediately possible.
One common edge case is vendor-owned software that creates local accounts during installation or upgrades. Another is shared service identities on platforms that cannot support per-instance credentials. In those cases, discovery should still establish ownership, usage scope, and a retirement plan, even if immediate removal is not realistic. Teams should also treat “break glass” accounts separately from true orphaned accounts, because emergency access may be valid but still require strong controls, monitoring, and documented approval. The Top 10 NHI Issues is a useful reminder that unmanaged credentials, excess privilege, and missing lifecycle controls often appear together rather than in isolation.
Another edge case is cloud and SaaS tenancy sprawl, where local users may exist in the application but not in the enterprise directory. Discovery should include those platforms too, because an account can be “local” to the app and still be externally reachable. For control design, map the process to NIST SP 800-53 Rev. 5 Security and Privacy Controls for access review, logging, and account management, then maintain a living exception register for anything that cannot yet be eliminated.
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, NIST SP 800-53 Rev 5, NIST AI RMF and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Orphaned and local accounts are a core NHI inventory and ownership gap. |
| NIST CSF 2.0 | PR.AA-01 | Identity and access management depends on knowing what accounts exist. |
| NIST SP 800-53 Rev 5 | AC-2 | Account management controls cover creation, review, disabling, and removal. |
| NIST AI RMF | Discovery and accountability support governance for automated and software identities. | |
| NIST Zero Trust (SP 800-207) | AC-6 | Zero Trust requires least privilege for every identity, including local ones. |
Review all application and local accounts on a schedule and disable anything without a valid business need.
