Hidden identities are access-related entities that exist outside standard IAM visibility, such as browser-stored sessions, unmanaged credentials, and informal access paths. They are difficult to govern because they are not always provisioned, monitored, or revoked through central identity workflows. That makes them a persistent source of shadow risk.
Expanded Definition
Hidden identities are access-bearing entities that sit outside normal IAM visibility, including browser-stored sessions, unmanaged API keys, ad hoc tokens, shared credentials, and informal access paths created during support, development, or incident response. In NHI security, the term is broader than “unknown accounts” because the access may be real even when no formal identity object exists in the directory.
Usage in the industry is still evolving. Some teams treat hidden identities as a subset of shadow IT, while others reserve the term for credentialed access that bypasses central lifecycle control. The practical distinction is whether the access can authenticate, authorize, and persist without normal provisioning, review, or revocation. That is why hidden identities often bridge IAM, secrets management, endpoint governance, and browser security. The NIST Cybersecurity Framework 2.0 emphasizes visibility, protection, and recovery as core outcomes, which maps directly to this problem space: if the identity cannot be seen, it cannot be governed effectively. The most common misapplication is assuming a missing directory record means no active access, which occurs when sessions, cached tokens, or local credentials remain valid after the formal account is removed.
Examples and Use Cases
Implementing controls around hidden identities often introduces friction for developers and operators, requiring organisations to weigh faster access restoration against tighter governance and shorter-lived access paths.
- A browser retains a long-lived session for a SaaS admin console after the user leaves the company, leaving access active outside IAM revocation workflows.
- A build pipeline uses a personal API key stored in a local config file, similar to patterns documented in Hard-Coded Secrets in VSCode Extensions, where credentials persist beyond intended use.
- A support engineer shares a password over chat to recover a production system, then never rotates it, creating an access path that is operationally real but poorly governed.
- A compromised browser extension exfiltrates cached tokens, echoing the exposure patterns described in JetBrains GitHub plugin token exposure, and the token continues to authenticate until it expires or is revoked.
- An enterprise discovers that a legacy service account is used by multiple scripts and operators, yet no owner can confirm all dependencies before decommissioning it.
These cases are especially relevant when a session, token, or key is created for convenience and then forgotten by design, not by accident. NIST guidance on digital identity and cyber hygiene reinforces that assurance depends on lifecycle control, not only on initial authentication events.
Why It Matters in NHI Security
Hidden identities matter because they undermine the central assumptions behind least privilege, monitoring, and offboarding. When access is created outside standard identity workflows, revocation becomes partial, audit trails become incomplete, and incident response has to chase down access paths that were never formally owned. This is especially dangerous for NHI estates, where secrets, tokens, and service accounts can outnumber human identities by a wide margin and move faster than manual review processes can track.
NHI Mgmt Group data shows that only 5.7% of organisations have full visibility into their service accounts, which illustrates how limited identity observability often is in practice. That visibility gap is the same condition that allows hidden identities to persist after a breach, a contractor exit, or a cloud migration. The risk becomes acute when a hidden session or unmanaged secret is reused across systems, because one overlooked credential can expose multiple workloads. The NIST Cybersecurity Framework 2.0 provides a useful governance lens, but the operational burden remains finding and classifying access that was never cleanly entered into IAM. Organisations typically encounter the consequence only after a leaked token, unexpected login, or failed offboarding review, at which point hidden identity cleanup becomes operationally unavoidable to address.
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 and OWASP Agentic AI Top 10 address the attack and risk surface, while NIST CSF 2.0, NIST SP 800-63 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-02 | Hidden identities are often unmanaged secrets and tokens outside lifecycle controls. |
| NIST CSF 2.0 | ID.AM-1 | Asset and identity visibility are required to detect access paths that bypass IAM. |
| NIST SP 800-63 | AAL2 | Session and authenticator assurance matter when access persists beyond formal IAM records. |
| NIST Zero Trust (SP 800-207) | 5.2 | Zero Trust depends on continuous verification of every access path, including hidden ones. |
| OWASP Agentic AI Top 10 | AIA-05 | Autonomous agents often rely on hidden credentials and informal access paths. |
Inventory hidden credentials, bind ownership, and revoke anything not tracked in a governed lifecycle.
Related resources from NHI Mgmt Group
- How should IAM teams govern application identities that are hidden in code and runtime flows?
- Why do hidden application identities create risk for identity-first security programmes?
- Why do hidden identities increase breach risk so quickly?
- Why do nonhuman identities create hidden risk in customer-facing systems?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on August 27, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
