Non-human identities used by software, pipelines, integrations, and infrastructure components to authenticate and act. They are governance-critical because they often carry durable access, bypass normal user workflows, and can create significant exposure if they are not reviewed, rotated, or revoked.
Expanded Definition
Machine and service account are non-human identities assigned to software, workloads, pipelines, and infrastructure components so they can authenticate and perform actions without a person in the loop. In NHI governance, the key distinction is that these identities are operational actors, not administrative conveniences, and they therefore need lifecycle controls similar to privileged user accounts.
Definitions vary across vendors on where a machine account ends and a service principal, workload identity, or integration token begins. NHI Management Group treats the term broadly: if the identity can obtain credentials, call APIs, or modify systems autonomously, it belongs in the machine and service account governance model. That model should align to least privilege, rotation, scoping, and offboarding controls reflected in NIST Cybersecurity Framework 2.0 and the operational realities described in Ultimate Guide to NHIs.
The most common misapplication is treating these accounts as static infrastructure plumbing, which occurs when teams create them for deployment or integration work but never assign ownership, expiry, or review cadences.
Examples and Use Cases
Implementing machine and service accounts rigorously often introduces lifecycle overhead, requiring organisations to weigh automation speed against credential sprawl and privileged access risk.
- CI/CD pipelines use a service account to deploy application releases into production, with narrowly scoped permissions and short-lived credentials.
- A backup platform authenticates to storage and database systems through a machine account that is rotated and monitored like any other privileged NHI.
- A data integration job calls internal APIs using a service identity whose access is recorded, reviewed, and revoked when the integration is retired.
- An application container retrieves secrets from a vault using workload identity instead of embedding long-term keys in code or config.
- Incident reviews map a compromised API key back to its owning service account so containment can include rotation, revocation, and dependency checks.
In breach analysis, machine and service accounts often appear as the initial foothold or the persistence mechanism, as shown in 52 NHI Breaches Analysis and the NIST Cybersecurity Framework 2.0 focus on continuous access governance. The practical pattern is simple: every automated actor should have an owner, a purpose, and an expiry condition.
Why It Matters in NHI Security
Machine and service accounts matter because they often outnumber human users, carry durable access, and bypass the normal friction that helps expose risky behaviour in interactive logins. NHI Management Group research shows that only 5.7% of organisations have full visibility into their service accounts, which means most security teams cannot reliably answer who owns them, what they can access, or whether they are still needed. That blind spot becomes especially dangerous when secrets are stored outside approved vaults or when access is never rotated after deployment.
Used well, these accounts support automation and resilience. Used poorly, they create silent privilege accumulation, lateral movement paths, and difficult-to-trace compromise. The risk is not abstract: Ultimate Guide to NHIs reports that 80% of identity breaches involved compromised non-human identities such as service accounts and API keys, and that context is directly relevant to machine identities. Governance should therefore connect account ownership, secret storage, rotation, and decommissioning to the broader control model in Dropbox Sign breach. Organisations typically encounter the impact only after a leaked key or abandoned integration is discovered, at which point machine and service account governance becomes operationally unavoidable to address.
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 and OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Covers discovery and ownership of non-human identities like service accounts. |
| OWASP Non-Human Identity Top 10 | NHI-02 | Addresses secret management failures tied to machine account credentials. |
| NIST CSF 2.0 | PR.AA-01 | Maps to identity and access governance for non-human actors. |
Inventory every machine and service account, assign an owner, and review purpose and access regularly.
