Because they often carry standing privilege, operate quietly, and remain valid long after the business need changes. That combination increases blast radius when a credential is exposed and makes detection harder than with human accounts. The risk is not the token itself. It is the duration and breadth of access it enables.
Why This Matters for Security Teams
service account and tokens are not just “non-human users.” They are access envelopes that can outlive the business process that created them, and they often bypass the review habits applied to human accounts. That is why exposed tokens frequently become a quiet path to data movement, lateral access, and persistent compromise. The issue is not unusual tooling, it is governance debt that compounds when secrets are duplicated, shared, or embedded in workflows.
The scale of that debt is visible in research from Entro Security, which found that 44% of NHI tokens are exposed in the wild and 91% of former employee tokens remain active after offboarding. That means many teams are still treating machine access as if it were ephemeral when it is actually standing access with weak lifecycle control. Current guidance from NIST Cybersecurity Framework 2.0 reinforces the need to identify, protect, and govern access assets continuously, not only at issuance.
In practice, many security teams discover the problem only after a token has already been used to move through systems that were never meant to share trust.
How It Works in Practice
The risk rises when a service account is granted broad RBAC permissions, then reused across applications, environments, or automation jobs. A token may start with one narrow purpose, but over time it becomes a convenient shortcut for developers, CI/CD pipelines, and integrations. If that token is copied into tickets, chat, code commits, or build logs, it becomes difficult to tell where it lives and whether it still needs to exist.
This is why the better control pattern is not “hide the token better,” but reduce the token’s usefulness. That usually means pairing PAM with just-in-time credential provisioning, short TTLs, and workload identity so the system proves what it is at runtime rather than relying on a long-lived secret. For automation, the practical goal is to issue credentials per task, scope them to a single workload or function, and revoke them automatically after completion. In that model, access is tied to execution context, not to a standing identity that can be reused indefinitely.
Secret sprawl makes the operational problem worse. Guide to the Secret Sprawl Challenge and the Salesloft OAuth token breach show how an exposed token can become a high-value pivot point when access is broader than expected. NIST guidance also supports a zero trust posture, where every request is evaluated rather than trusted because it originates from an internal workload.
- Inventory every service account and token, then map each one to a named owner and business purpose.
- Replace standing secrets with short-lived credentials where the platform supports it.
- Restrict each token to the smallest usable scope and separate duties by environment and application.
- Automate revocation when the workload is retired, changed, or offboarded.
- Log token use in a way that supports anomaly detection, not just audit storage.
These controls tend to break down in legacy integration-heavy environments because shared service accounts and hardcoded tokens are embedded so deeply that rotation cannot be done safely without redesign.
Common Variations and Edge Cases
Tighter credential control often increases delivery overhead, requiring organisations to balance operational speed against reduced blast radius. That tradeoff is real, especially where vendors, schedulers, or batch jobs cannot yet consume ephemeral identity cleanly. Current guidance suggests treating those exceptions as transitional risk, not as a reason to preserve standing privilege forever.
There is also no universal standard for every workload pattern yet. Some teams can adopt workload identity quickly through OIDC or SPIFFE-style trust, while others must rely on compensating controls such as vault-enforced rotation, scoped access gateways, and aggressive monitoring. The important point is that static secrets should not be the default just because the architecture is familiar. Where service accounts are reused across multiple applications, the compromise of one system can expose many more paths than the original owner intended.
Edge cases are common in build systems and AI-adjacent automation. The token may be issued for a narrow task, but the workflow later expands and the original scope no longer matches reality. That is one reason why JetBrains GitHub plugin token exposure and Internet Archive breach remain useful reminders: once a secret is embedded into tooling or automation, it can outlive the team’s assumptions about who can reach it and for how long.
In practice, the hardest cases are environments that mix modern identity controls with old service-account habits, because the weakest credential path tends to become the one that survives production change.
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 Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Long-lived service account credentials need rotation and expiry control. |
| NIST CSF 2.0 | PR.AC-4 | Least-privilege access and lifecycle governance apply directly to tokens. |
| NIST Zero Trust (SP 800-207) | Zero trust requires request-time validation instead of implicit trust in tokens. |
Inventory NHI credentials, enforce rotation, and remove standing secrets where TTL can be shortened.
