Why do Zero Trust programmes still depend on credential management?

Why This Matters for Security Teams

zero trust is often described as an access model, but in practice it is also a credential governance model. Every policy decision depends on the quality of the identity signal behind it, and for non-human workloads that signal is usually a secret, token, certificate, or workload credential. If those credentials are long-lived, over-scoped, or difficult to revoke, the Zero Trust promise of continuous verification weakens quickly.

This is why NHI governance sits inside the trust chain, not beside it. NIST’s NIST SP 800-207 Zero Trust Architecture emphasizes ongoing verification, while NHIMG’s Ultimate Guide to NHIs, Lifecycle Processes for Managing NHIs makes clear that lifecycle control is what keeps non-human access bounded. When organisations lose sight of that, they end up compensating for weak credential hygiene with more policy layers, more exceptions, and more manual review.

NHIMG’s 2024 Non-Human Identity Security Report found that 59.8% of organisations see value in dynamic ephemeral credentials, which is telling because the market is still trying to close a basic gap between policy ambition and credential reality. In practice, many security teams encounter credential sprawl only after a workload compromise has already converted “verified access” into persistent access.

How It Works in Practice

Zero Trust programmes still depend on credential management because every runtime decision needs a trustworthy proof of identity, device, workload, or session. For humans, that proof is often a user session and MFA context. For NHI and agentic workloads, it is more often a certificate, short-lived token, or signed workload assertion. If the credential cannot be issued, scoped, rotated, and revoked cleanly, the policy engine has nothing reliable to evaluate.

The practical pattern is to combine workload identity with just-in-time issuance. Instead of embedding static secrets in code or pipelines, teams use ephemeral credentials with tight TTLs and automatic revocation on task completion. That reduces the blast radius if a token is captured, and it aligns access to the actual workload rather than to a reusable secret sitting in a vault. NHIMG’s Ultimate Guide to NHIs, Static vs Dynamic Secrets is a useful reference for this distinction, and the Guide to SPIFFE and SPIRE shows how cryptographic workload identity can replace weaker shared-secret patterns.

• Issue credentials per workload or per task, not per team or environment.
• Bind credentials to context such as service identity, destination, and runtime policy.
• Rotate automatically and revoke on failure, completion, or anomaly.
• Evaluate access at request time, using policy-as-code rather than static allowlists.

That approach is consistent with the OWASP Non-Human Identity Top 10, which treats secret exposure and lifecycle weakness as primary control failures, not edge cases. These controls tend to break down when legacy applications require shared service accounts because the architecture cannot express per-request identity or short-lived token exchange.

Common Variations and Edge Cases

Tighter credential control often increases operational overhead, requiring organisations to balance reduced risk against migration complexity and runtime reliability. That tradeoff is especially visible in hybrid estates, where older systems cannot consume federated tokens, and in multi-cloud environments, where identity formats and token exchange paths differ. Current guidance suggests that these environments need compensating controls, but there is no universal standard for this yet.

Some teams overcorrect by treating Zero Trust as a network segmentation problem and leaving credentials untouched. Others adopt token lifetimes that are so short they create brittle workflows and drive developers back toward static secrets. The better approach is to match TTL and revocation speed to workload criticality, then enforce a clean fallback path for break-glass access under NIST Cybersecurity Framework 2.0 and the access control expectations in NIST SP 800-53 Rev 5 Security and Privacy Controls.

For agentic systems, the bar is even higher. Autonomous agents may chain tools, call downstream services, and request new credentials mid-task, so static RBAC alone is not enough. NHIMG’s Top 10 NHI Issues highlights that secret sprawl and weak lifecycle discipline are recurring failure modes, especially when access is created faster than it is reviewed.

Related resources from NHI Mgmt Group

• Why do zero-trust programmes depend on ingress policy in Kubernetes?
• Why do email impersonation attacks still work in Zero Trust programmes?
• How should security teams run GRC programmes with continuous trust rather than annual audit panic?
• Who should own microsegmentation decisions in a zero trust programme?