Manual renewals become a problem because certificate volume grows faster than the time available to process each renewal. Every renewal requires checking dates, revalidating configuration, and coordinating with application owners, so even small delays multiply across thousands of certificates. At scale, the issue becomes operational capacity, not just process quality.
Why This Matters for Security Teams
Manual certificate renewal becomes a scaling problem because certificates are not a one-time asset. They are living credentials that expire, drift, and depend on owners, systems, and approvals that may no longer be easy to trace. As estates grow, the renewal queue expands faster than human review capacity, and the operational risk shifts from “did someone remember?” to “how many will fail at once?” The SailPoint research on machine identity management found that certificate expiry is the leading cause of outages for 45% of organisations, which is why this is treated as an availability issue as much as an identity issue.
Security teams also underestimate the coordination overhead. Each renewal may require validation of hostname changes, application testing, secret distribution, and change approval, which means the bottleneck is often outside the certificate authority itself. The result is predictable: expired certificates, emergency fixes, and avoidable downtime. In practice, many security teams encounter the failure only after an outage has already forced a hurried exception.
How It Works in Practice
At small scale, a manual renewal process can work because a person can track expiry dates in a spreadsheet, confirm dependencies, and update the certificate before deadline. At enterprise scale, that same workflow breaks because certificate volume, service ownership churn, and distributed deployment models create too many moving parts for ad hoc tracking. NHI Management Group’s NHI Lifecycle Management Guide and the broader Lifecycle Processes for Managing NHIs both show that renewal is only one step in a larger identity lifecycle that includes inventory, ownership, validation, distribution, and revocation.
The practical failure mode is usually not the renewal task itself but the surrounding dependencies. Teams must know what exists, who owns it, where it is deployed, and whether the replacement certificate can be rolled without breaking the application. Manual workflows also struggle with certificates embedded in CI/CD pipelines, containers, load balancers, and third-party integrations. That is why current guidance increasingly points toward automation, inventory-driven renewal, and policy-based rotation rather than ticket-based reminders. The OWASP Non-Human Identity Top 10 is especially relevant here because expired or poorly governed machine credentials often reflect the same underlying control gaps.
- Use a complete inventory so renewal is driven by actual assets, not spreadsheet entries.
- Automate discovery, expiry monitoring, and renewal triggers where possible.
- Assign a clear owner for every certificate and every service that depends on it.
- Test renewal workflows in non-production so failures surface before expiry windows close.
These controls tend to break down in hybrid estates with legacy appliances, outsourced operations, and certificates tied to undocumented applications because the ownership and deployment path are no longer clear enough for automation to act safely.
Common Variations and Edge Cases
Tighter renewal control often increases operational overhead, so organisations have to balance reduced outage risk against the cost of building and maintaining automation. Some environments can absorb this cost quickly, while others need a phased approach.
There is no universal standard for manual renewal thresholds, but best practice is evolving toward short-lived certificates, automated renewal, and stronger lifecycle governance for high-change systems. Edge cases appear in regulated environments, air-gapped networks, and legacy platforms that cannot support modern automation. In those settings, manual renewal may remain necessary, but it should be treated as a controlled exception with explicit owners, earlier warning windows, and documented rollback steps. The broader secret-management problem is the same one highlighted in NHI research such as the Guide to the Secret Sprawl Challenge and the Guide to NHI Rotation Challenges: the larger the estate, the more manual handling turns into latent risk.
For most teams, the real decision is not whether to eliminate every manual renewal, but which certificates are still safe to renew by hand and which ones now demand automation because the blast radius of failure is too high.
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 AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Manual renewals are a lifecycle control gap for machine credentials. |
| NIST CSF 2.0 | PR.DS-1 | Certificates are data-in-transit protections that fail when renewal is missed. |
| NIST AI RMF | Lifecycle governance applies to any automated credential system at scale. |
Define accountability, monitoring, and escalation for identity assets with expiry risk.
Related resources from NHI Mgmt Group
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on June 27, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
