Why do manual access processes create risk in critical infrastructure environments?

Why This Matters for Security Teams

Manual access processes are especially risky in critical infrastructure because they depend on people noticing change, opening requests, approving them, and following through before operations move on. That model is too slow for plants, utilities, transport, and other high-availability environments where contractors rotate, duties shift, and privileged access is often needed only for a narrow window. NIST’s Cybersecurity Framework 2.0 treats access governance as an ongoing control activity, not a one-time administrative task.

NHIMG research shows the operational consequences are not theoretical. In The 2024 ESG Report: Managing Non-Human Identities, two-thirds of enterprises reported a successful cyberattack resulting from compromised non-human identities. In critical infrastructure, the same gap often appears as stale access, delayed deprovisioning, or emergency exceptions that linger long after the incident has passed. In practice, many security teams encounter excessive privilege only after an outage, audit finding, or contractor offboarding failure has already exposed the gap.

How It Works in Practice

Manual access creates risk because each step introduces delay and inconsistency. A manager may approve access, but the account still needs to be created, scoped, reviewed, and later removed. If the request concerns a contractor, operator, or third-party maintainer, the risk increases because the access window is usually tied to a specific task, shift, or outage. The longer that process takes, the more likely access outlives its legitimate purpose.

For critical infrastructure, stronger practice is to replace static entitlement handling with controlled, time-bound access. That usually means combining just-in-time approval, short-lived credentials, and explicit review for privileged actions. NHIMG’s Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs emphasises that identity lifecycle discipline matters as much for service accounts and automations as it does for people. The OWASP Non-Human Identity Top 10 also highlights why over-privileged, poorly governed identities become an attack path.

• Use time-boxed access for maintenance and incident response, then revoke automatically when the task ends.
• Separate routine operator access from elevated access so approval is tied to a specific action, not a permanent role.
• Track who approved access, when it started, and when it ended so audits can verify control effectiveness.
• Prefer automated deprovisioning for leavers and contractors rather than waiting for manual ticket closure.

Security teams should also align with CISA cyber threat advisories and internal operational change windows so access expiry matches the actual work, not the paperwork. These controls tend to break down in 24/7 environments where emergency overrides, shared admin accounts, and legacy OT tooling prevent timely revocation.

Common Variations and Edge Cases

Tighter access control often increases operational overhead, requiring organisations to balance speed of restoration against the need to reduce standing privilege. That tradeoff is real in critical infrastructure, where an over-restrictive process can slow fault recovery or incident response. Current guidance suggests the answer is not to relax controls, but to make exceptions explicit, temporary, and fully logged.

One common edge case is emergency access. During a grid event, plant outage, or safety incident, teams may need immediate privilege before a normal approval chain can complete. In those moments, best practice is evolving toward pre-approved break-glass access with automatic expiry and post-event review. Another edge case is third-party maintenance, where vendor accounts may be needed intermittently over months. Those identities should not remain active between sessions.

NHIMG’s 52 NHI Breaches Analysis shows how often identity weaknesses become the entry point for broader compromise, which is why manual offboarding is especially dangerous when accounts are shared, inherited, or buried in legacy systems. The right control is not merely faster ticketing; it is lifecycle enforcement that matches the real operating model. Where organisations rely on long-lived credentials, air-gapped approval steps, or disconnected asset ownership, the process becomes too fragmented to keep pace with access change.

Related resources from NHI Mgmt Group

• Why do non-human identities create audit risk in modern environments?
• When does JIT access create more risk than it reduces?
• Why do manual provisioning processes increase access risk in dynamic environments?
• Why do non-human identities create more audit risk than human accounts?