They are not created, changed, or retired by HR events, so the normal employee lifecycle does not signal when access should begin or end. Service accounts can persist long after the workload changes, and API keys can outlive the integration that created them. That breaks the assumption that lifecycle events arrive from a central people system.
Why This Matters for Security Teams
service account and api key are operationally convenient, but they sit outside the human lifecycle that most joiner-mover-leaver workflows were built around. That means access can remain active after a team, application, vendor, or automation path has changed, creating a blind spot in entitlement review and revocation. The risk is not only excess access, but also stale trust that can be reused in lateral movement, automation abuse, and credential stuffing against downstream systems.
NHIMG research on the Secret Sprawl Challenge shows how quickly secrets can multiply once they leave a controlled issuance process, while the 52 NHI Breaches Analysis illustrates a recurring pattern: credentials outlive ownership, and ownership outlives documentation. That mismatch is exactly why JML processes fail when they rely on HR as the system of record for non-human access.
Current guidance from the NIST Cybersecurity Framework 2.0 supports continuous access governance rather than one-time provisioning checks, but many organisations still treat service accounts as “set and forget.” In practice, security teams usually discover the problem only after an integration is retired, a CI/CD runner is reused, or an exposed key is already being abused.
How It Works in Practice
The practical issue is that service accounts and API keys are not people. They are workload credentials, which means their lifecycle should be tied to application state, deployment state, and ownership state, not HR events. A joiner event may create the initial access path, but movers and leavers often do not map cleanly to the systems that actually use the credential. When teams depend on manual ticketing, spreadsheets, or periodic audits, the credential inventory drifts from reality.
Effective handling starts with identity scoping. Each service account should have a named owner, a defined workload purpose, and a documented expiry or review trigger. API keys should be issued per integration where possible, rotated on a schedule, and revoked when the workload is decommissioned or replaced. Best practice is evolving toward treating these as part of a broader Non-Human Identity inventory rather than as incidental secrets.
Practitioners typically reduce risk by combining:
- Automated discovery of service accounts and keys across cloud, CI/CD, and SaaS platforms
- Ownership tags that point to a team, system, and approver
- Short TTLs and rotation for keys that cannot be eliminated
- Revocation hooks tied to application retirement, vendor offboarding, or pipeline replacement
- Least-privilege policies mapped to the workload’s actual function, not its historical use
NIST CSF 2.0 and the Dropbox Sign breach both reinforce the same operational lesson: visibility and accountability matter more than initial issuance. These controls tend to break down when service accounts are shared across multiple systems because ownership becomes ambiguous and revocation can unintentionally disrupt production dependencies.
Common Variations and Edge Cases
Tighter lifecycle control often increases operational overhead, requiring organisations to balance revocation speed against uptime risk. That tradeoff is real, especially for legacy applications, third-party integrations, and machine-to-machine workflows that cannot easily tolerate frequent key rotation or service account replacement.
One common edge case is a shared service account used by multiple applications. Current guidance suggests this should be phased out, but there is no universal standard for how quickly, because replacement can require code changes, infrastructure updates, and coordination across teams. Another case is vendor-managed integrations, where the “owner” of the key may be an external party. In those environments, the JML process should include contract-driven review points, not just internal access reviews.
Another operational wrinkle is break-glass or emergency automation credentials. These may need longer retention and broader scope, but they should still be isolated, monitored, and reviewed separately from ordinary workload keys. NHIMG’s coverage of BeyondTrust API key breach and Microsoft Azure OpenAI service breach shows why exceptions deserve the same discipline as standard accounts, not less.
The practical rule is simple: if the credential is not tied to a person, then the JML process must be tied to the workload, the pipeline, or the vendor relationship. Anything else leaves revocation dependent on memory, and memory is not a control.
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 | Addresses stale non-human credentials that outlive their intended workload. |
| NIST CSF 2.0 | PR.AC-4 | Covers least-privilege access and ongoing access review for workload identities. |
| NIST AI RMF | Supports governance for autonomous or automated systems that use non-human credentials. |
Inventory each service account and API key, then revoke or rotate anything without a current owner.
Related resources from NHI Mgmt Group
- What problem does ownership attribution solve for service accounts and API keys?
- How can organisations reduce the risk of stale API keys and machine tokens?
- How should teams reduce the risk of orphaned service accounts and stale tokens?
- When should organisations review service accounts and API keys?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on June 7, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
