What breaks when certificate renewal is managed with spreadsheets and ticket queues?

Why This Matters for Security Teams

Certificate renewal is one of those operational tasks that looks simple until the estate grows beyond what a spreadsheet can safely represent. Once certificates support APIs, service mesh traffic, CI/CD systems, and internal services, expiry becomes an availability problem, not just an administrative one. Manual tracking also obscures ownership, making it harder to know who is accountable when renewal windows collide or a dependency changes late.

NHI Management Group has documented how machine identity programs still lean heavily on manual tracking, with 61% relying on spreadsheets or manual processes and certificate expiry cited as the leading cause of outages for 45% of organisations in The Critical Gaps in Machine Identity Management report. That lines up with broader NHI guidance in the Ultimate Guide to NHIs, where lifecycle control and visibility are treated as core security functions, not admin overhead. In practice, teams usually discover the weakness only after a certificate has already expired or a renewal ticket has stalled in someone’s queue.

Security teams also miss the broader point: certificates are workload identity artifacts, so renewal failure is a trust failure. The OWASP Non-Human Identity Top 10 and the NIST Cybersecurity Framework 2.0 both reinforce that identity lifecycle hygiene is part of resilience, not just compliance.

How It Works in Practice

Spreadsheets and ticket queues fail because they are human-paced controls applied to machine-paced dependencies. A certificate can be used by dozens of services, embedded in automation, and renewed only if every owner sees the same deadline at the same time. That is rarely true. Best practice is evolving toward certificate lifecycle automation that discovers assets continuously, assigns ownership, checks expiry windows, and renews or replaces certificates through policy, not ad hoc follow-up.

Operationally, strong programs treat renewal as part of workload identity management. That means inventorying certificates, mapping them to the systems that consume them, setting explicit TTLs, and automating renewal with short-lived credentials where possible. Where longer-lived certificates are unavoidable, renewal should be triggered by policy and enforced through central lifecycle tooling rather than manual reminders. NHI Management Group’s NHI Lifecycle Management Guide and static vs dynamic secrets guidance both point to the same practical lesson: the shorter the credential lifetime, the less room there is for manual failure.

• Maintain an always-current inventory of certificates and their owners.
• Automate renewal checks based on policy thresholds, not calendar reminders.
• Use central logging so expiring certificates are visible before outages begin.
• Standardise exception handling for legacy systems that cannot auto-renew.

Where this guidance breaks down is in fragmented environments with unmanaged infrastructure, hard-coded certificates, or application teams that bypass the central issuance path because the renewal workflow cannot meet their deployment cadence.

Common Variations and Edge Cases

Tighter certificate controls often increase operational overhead, so organisations have to balance reliability against compatibility, especially in mixed estates with legacy appliances, third-party SaaS, and embedded systems. There is no universal standard for this yet, but current guidance suggests that exceptions should be time-bound and explicitly risk-accepted rather than treated as permanent process gaps.

Some environments need special handling. Air-gapped systems may require offline renewal packages. Shared certificates across many services create blast-radius concerns if a renewal fails or is rolled back incorrectly. Short-lived certificates reduce exposure, but they also demand stronger automation and observability because human intervention is slower than the credential lifetime. The Top 10 NHI Issues and the regulatory and audit perspectives highlight why auditability matters here: renewal evidence, ownership, and revocation need to be demonstrable, not implied.

The practical test is simple. If an organisation cannot answer which certificates expire next week, who owns them, and whether renewal is automated, then the process is already too manual to be dependable. Mature programs move renewal out of ticket queues and into policy-driven workflows before the next outage forces the issue.

Related resources from NHI Mgmt Group

• What breaks when certificate renewal and algorithm changes are still managed manually?
• What breaks when certificate renewal is managed separately in each cloud?
• What breaks when access approvals stay in ticket queues too long?
• What breaks when certificate management still depends on spreadsheets?