The most common and consequential mistake is hardcoding credentials into source code, configuration files, or container images. This single practice creates most of the secrets sprawl, environment segregation violations, and unrotated credential problems that NHI security programmes spend the majority of their remediation effort addressing.
Why This Matters for Security Teams
Hardcoded secrets are not just a hygiene issue. They turn every repo, image, and deployment artifact into a credential reservoir that is difficult to inventory, harder to rotate, and often invisible to standard access reviews. Once a secret is embedded, it can be copied into forks, caches, logs, and build outputs, which means the blast radius expands far beyond the original application. That is why NHI programmes usually treat this as a lifecycle failure, not a single coding mistake, as discussed in Guide to the Secret Sprawl Challenge and the Ultimate Guide to NHIs — Static vs Dynamic Secrets.
The risk is well documented. In the Ultimate Guide to NHIs, 96% of organisations store secrets outside secrets managers in vulnerable locations such as code, config files, and CI/CD tools. That pattern undermines least privilege, makes revocation slow, and creates compliance gaps when teams cannot prove where a secret exists or who has used it. Current guidance from OWASP Non-Human Identity Top 10 and NIST Cybersecurity Framework 2.0 points to inventory, protection, and continuous monitoring as the practical baseline. In practice, many security teams encounter this only after source control scanning or a breach notification exposes secrets that had already been active for months.
How It Works in Practice
The operational fix is to stop treating credentials as static build inputs and start treating them as runtime-issued NHIs. That means secrets should be generated or fetched just in time, scoped to a task, and revoked as soon as the workload finishes. For service-to-service and pipeline access, workload identity is the better primitive because it proves what the workload is, not where a password was copied. This approach aligns with the identity and access direction described in NIST SP 800-63 Digital Identity Guidelines and the lifecycle emphasis in NHI Lifecycle Management Guide.
In practice, the control stack usually includes three moves:
- Replace embedded API keys, tokens, and certificates with brokered issuance from a secrets manager or workload identity service.
- Bind credentials to short TTLs and task context so they expire automatically instead of depending on manual cleanup.
- Scan repositories, images, and CI/CD definitions continuously, then block merges when secrets are detected.
For many organisations, the hardest part is not detection but change management. Teams need to refactor legacy jobs, remove long-lived service account dependencies, and make sure downstream systems accept federated or ephemeral authentication. The remediation lesson is clear in breach analyses such as 52 NHI Breaches Analysis, where exposed secrets tend to reappear across multiple environments because the original secret was copied rather than issued. These controls tend to break down when legacy applications require shared account passwords because the application cannot request or validate short-lived credentials.
Common Variations and Edge Cases
Tighter secret controls often increase delivery overhead, requiring organisations to balance developer speed against revocation discipline. There is no universal standard for every application pattern yet, especially where vendor software, air-gapped systems, or batch jobs cannot natively use workload identity. In those cases, the best practice is evolving toward compensating controls rather than pretending hardcoded credentials are acceptable.
Edge cases usually fall into three categories. First, third-party integrations may still require a static credential, but that should be isolated, vault-backed, monitored, and rotated on a fixed schedule. Second, some legacy systems can only accept a file-based secret at startup, so the secret should still be injected at deployment time rather than stored in the repository. Third, ephemeral secrets are not a cure-all if the underlying authorisation model is weak; a short-lived token with excessive privilege still creates unnecessary exposure. That is why NHI governance should pair secret hygiene with Top 10 NHI Issues guidance on visibility and rotation, plus external alignment such as NIST Cybersecurity Framework 2.0 and OWASP Non-Human Identity Top 10. The common thread is simple: if a secret can be copied once and reused indefinitely, the organisation has not actually solved credential management.
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 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 | Hardcoded and unrotated secrets are a core NHI credential management failure. |
| NIST CSF 2.0 | PR.AC-1 | Credential sprawl undermines identity proofing and access control. |
| NIST Zero Trust (SP 800-207) | SC-7 | Static secrets weaken zero trust by enabling persistent access beyond task need. |
Eliminate embedded credentials, enforce rotation, and require short-lived secrets for all NHIs.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on May 16, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
