Unmanaged credentials create risk because they often lack owners, rotation schedules, and audit history. They usually appear when an application does not support SAML or OIDC, or when teams copy passwords into shared workspaces to keep business moving. That leaves real access in place without clear accountability, which expands the attack surface and complicates audit readiness.
Why This Matters for Security Teams
Unmanaged credentials are not just an IAM hygiene issue. In mixed SSO and non SSO environments, they become an invisible control gap where access exists outside central policy, review, and revocation workflows. That matters because attackers do not need a perfectly governed path if a forgotten password, API key, or shared secret can still reach production data. The OWASP Non-Human Identity Top 10 makes this problem explicit, and NIST’s identity guidance reinforces that assurance depends on knowing what is issued, to whom, and under what lifecycle rules. In practice, unmanaged access often grows fastest in the exact systems teams assume are “temporary” or “low risk.” OWASP Non-Human Identity Top 10 helps frame the exposure, while Guide to the Secret Sprawl Challenge shows how quickly secrets spread once they are copied outside formal systems. In practice, many security teams encounter this only after an audit exception, a failed offboarding, or a breach review reveals credentials no one knew still worked.
How It Works in Practice
The risk increases because mixed environments split identity governance into two tracks. SSO apps inherit lifecycle controls such as central authentication, conditional access, and deprovisioning. Non SSO apps often rely on local usernames, passwords, service accounts, shared tokens, or embedded secrets. Once those credentials are copied into tickets, chat, spreadsheets, or code repositories, the access path becomes durable even when the original business need changes.
A practical response starts by classifying every credential by owner, purpose, and revocation path. Then teams separate human access from workload access, because service credentials should not be managed like employee logins. Current guidance suggests using short-lived secrets where possible, with rotation tied to task completion or expiry rather than calendar reminders. That is consistent with the lifecycle thinking in the Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs and the dynamic-secret approach in Ultimate Guide to NHIs — Static vs Dynamic Secrets. Security teams should also search for credential duplication across code, CI/CD, shared drives, and browser password stores, because the same secret frequently exists in multiple places with different owners.
A useful operating model is:
- Inventory all non-SSO applications and map every credential to a business owner.
- Replace shared credentials with named accounts or workload identities where the system allows it.
- Use vaulting, rotation, and least privilege for anything that cannot be SSO-integrated.
- Remove standing access when the app or integration is retired.
NIST CSF 2.0 and NIST SP 800-53 Rev. 5 both support this kind of control mapping, especially where asset visibility and access governance are incomplete. These controls tend to break down in legacy applications and outsourced platforms that do not support modern federation or programmatic rotation, because the only available path is still a long-lived shared secret.
Common Variations and Edge Cases
Tighter credential control often increases operational overhead, requiring organisations to balance security gain against application compatibility and support burden. That tradeoff is most visible in legacy SaaS, industrial systems, partner portals, and admin consoles that cannot support SAML or OIDC. In those cases, the best practice is evolving rather than universal: there is no single standard for how to govern every unmanaged secret, but the direction is clear. Reduce standing credentials wherever possible, then compensate with vaulting, privileged access workflows, and aggressive expiry.
A second edge case is automation. Not every non SSO credential is “bad”; many are legitimate workload identities for scripts, integrations, or CI jobs. The risk comes from static, reusable credentials that outlive the job they were created for. That is why NHI governance and identity assurance need to extend beyond user login systems. The Top 10 NHI Issues and NHI Lifecycle Management Guide are useful references for setting ownership, rotation, and retirement expectations.
The operational question is not whether a credential is human or machine. It is whether the organisation can prove who owns it, where it is used, and how it is revoked before it becomes an untracked path into the environment. That distinction is where mixed SSO and non SSO estates usually fail first.
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 800-63, 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-03 | Addresses unmanaged secret rotation and lifecycle gaps in mixed estates. |
| NIST CSF 2.0 | PR.AC-4 | Supports least-privilege access governance where SSO is unavailable. |
| NIST SP 800-63 | AAL | Identity assurance weakens when local credentials bypass federated controls. |
| NIST AI RMF | AI RMF helps evaluate governance and operational risk from unmanaged access paths. | |
| NIST Zero Trust (SP 800-207) | SP 800-207 | Zero trust requires explicit verification even when SSO is missing. |
Use assurance-based authentication for supported apps and document compensating controls for legacy access.
