Unmanaged certificates create hidden trust paths, expired credentials, and inconsistent authentication across users, devices, APIs, and workloads. In remote and multi-cloud environments, that complexity makes it easier for attackers to exploit stale trust or missing revocation checks. PKI reduces this risk by binding identity to cryptographic proof and enforcing consistent lifecycle control.
Why This Matters for Security Teams
Unmanaged certificates and machine identities are risky because they create trust that is often invisible to normal access reviews. Unlike human accounts, these identities are embedded in APIs, workloads, service meshes, CI/CD pipelines, and remote endpoints, so teams can lose track of who can authenticate, when a certificate expires, or whether revocation is actually enforced. NIST’s NIST Cybersecurity Framework 2.0 emphasizes governance and continuous risk management, which is exactly what unmanaged machine trust lacks.
NHIMG research shows how common the gap is: the 2024 Non-Human Identity Security Report found that 35.6% of organisations cite consistent access across hybrid and multi-cloud environments as their top NHI security challenge, while 88.5% say their non-human IAM practices lag human IAM. That mismatch matters because remote work and multi-cloud deployment multiply the number of places a stale certificate can be copied, forgotten, or reused.
In practice, many security teams discover the problem only after an expired or over-permissive certificate has already disrupted services or enabled lateral movement.
How It Works in Practice
Good certificate governance treats machine identity as a lifecycle problem, not a one-time issuance event. The control point is not just PKI issuance. It also includes inventory, ownership, rotation, revocation, short-lived credentialing, and policy enforcement at the moment of use. That approach lines up with NHI Lifecycle Management Guide and the broader risk themes in the Top 10 NHI Issues.
For remote and multi-cloud environments, the practical model usually includes:
- Discover every certificate, secret, and workload identity across cloud accounts, clusters, and edge systems.
- Map each identity to an owner, workload, and business purpose so unused trust can be removed.
- Use short TTLs and automated renewal for service-to-service authentication instead of long-lived static certificates.
- Enforce revocation checking and alert on certificates that cannot be traced to a managed source of truth.
- Bind workload identity to cryptographic proof and policy, rather than trusting network location or device posture alone.
NIST SP 800-53 Rev. 5 supports this kind of control discipline through access, audit, and system integrity requirements, even though it does not prescribe one certificate toolchain. For implementation, current guidance also favors workload identity patterns such as SPIFFE, because they reduce dependence on static shared secrets and make rotation operationally realistic. These controls tend to break down in highly fragmented multi-cloud estates where different teams issue certificates independently and no single system can prove revocation status in real time.
Common Variations and Edge Cases
Tighter certificate control often increases operational overhead, requiring organisations to balance stronger authentication against deployment speed and service continuity. That tradeoff becomes sharper when legacy systems, partner integrations, or air-gapped environments cannot easily support short-lived credentials or automated renewal. In those cases, current guidance suggests compensating controls such as strict ownership, certificate pinning where appropriate, and aggressive expiry alerting, but there is no universal standard for every environment yet.
Edge cases appear most often in hybrid estates where one cloud uses native identity federation, another relies on manually managed PKI, and a third still has embedded certificates in application code. Those environments create hidden trust paths that bypass normal IAM review. The risk is even higher when teams confuse device identity with workload identity or assume that TLS alone solves authorization. TLS protects transport, not governance.
For deeper context on how unmanaged trust contributes to real-world compromise, see Sisense breach and the Ultimate Guide to NHIs - Key Challenges and Risks. The hardest failures usually show up where certificate sprawl crosses team boundaries and no one owns the renewal, revocation, or audit trail end to end.
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 Zero Trust (SP 800-207) and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Directly addresses unmanaged NHI credentials and lifecycle rotation gaps. |
| NIST CSF 2.0 | PR.AC-4 | Supports least-privilege access control for machine identities and services. |
| NIST SP 800-53 Rev 5 | IA-5 | Covers authenticator management, including issuance, renewal, and revocation. |
| NIST Zero Trust (SP 800-207) | SC-? | Zero trust requires continuous verification of machine identities across environments. |
| NIST AI RMF | Risk governance applies to autonomous systems that rely on machine identities. |
Inventory all machine certificates, enforce ownership, and automate rotation before expiry.
Related resources from NHI Mgmt Group
- Why do machine identities increase lateral movement risk in cloud and SaaS environments?
- Why do stale non-human identities increase breach risk in hybrid and multi-cloud environments?
- How do overprivileged NHIs increase breach impact in cloud environments?
- Why do stale service identities increase risk in cloud environments?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on August 24, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
