Why do unmanaged service accounts and local credentials create such a large governance gap?

Why This Matters for Security Teams

Unmanaged service accounts and local credentials create a governance gap because they bypass the controls that make human identity manageable: joiner-mover-leaver workflows, periodic access reviews, and owner attestation. Once a secret is embedded in code, cached on a host, or shared informally, it can outlive the system it was meant to protect. That is why they are repeatedly called out in the OWASP Non-Human Identity Top 10 and in NHIMG’s Top 10 NHI Issues coverage.

The governance problem is not just visibility. It is that these identities often operate with durable privileges and no reliable business owner, so no one is clearly accountable for rotation, revocation, or scope reduction. In practice, teams discover the risk only after a legacy credential is reused in a breach path or a dormant account becomes the easiest route into a sensitive environment.

How It Works in Practice

Service accounts and local credentials become a large governance gap when they are treated as technical artifacts instead of managed identities. A local admin password on a server, a shared API token in a config file, or a service principal with no owner can all remain active long after the original use case has changed. Best practice is to treat these as non-human identities with the same discipline applied to human access, but the lifecycle must be more automation-heavy because manual review does not scale.

A practical control pattern is to pair inventory, ownership, and secret handling:

• Maintain an authoritative inventory of every service account, local credential, and secret-backed workload identity.
• Assign a named owner and a business purpose so review and revocation are not ambiguous.
• Replace static secrets with short-lived credentials where possible, as outlined in NHIMG’s Ultimate Guide to NHIs - Static vs Dynamic Secrets.
• Use lifecycle processes to rotate, revoke, and retire credentials when the workload changes, as described in Ultimate Guide to NHIs - Lifecycle Processes for Managing NHIs.
• Apply review evidence from the NIST Cybersecurity Framework 2.0 and map access decisions to current business need, not historical convenience.

For implementation, teams increasingly prefer workload-aware controls such as vault-backed issuance, just-in-time access, and policy checks at request time rather than permanent secrets stored on disk. That aligns with the direction of current guidance from NIST and the control language in the OWASP Non-Human Identity Top 10. These controls tend to break down when local credentials are hard-coded into legacy appliances or when shared service accounts are embedded in systems that cannot support rotation without downtime.

Common Variations and Edge Cases

Tighter control over service accounts often increases operational overhead, requiring organisations to balance security gains against uptime, deployment speed, and legacy compatibility. That tradeoff is especially visible in systems that cannot easily accept dynamic secrets or where a vendor requires a static local account for patching, batch jobs, or embedded integrations.

There is no universal standard for this yet, but current guidance suggests prioritising the highest-risk credentials first: shared admins, domain-level service accounts, and secrets that unlock production or data-access paths. Low-risk local accounts may remain temporarily, but only with documented ownership, rotation discipline, and compensating monitoring. NHIMG’s research on the Guide to the Secret Sprawl Challenge and the 2024 Non-Human Identity Security Report shows why this matters: organisations still report weak confidence in workload identity management and persistent reliance on insecure sharing methods.

The hardest edge case is the “necessary” account that no one wants to touch because too many systems depend on it. In those environments, security teams usually need a phased migration plan, not a single cleanup project. In practice, unmanaged credentials become entrenched fastest in hybrid estates and long-lived operational technology stacks, where identity ownership is diffuse and rotation is treated as optional maintenance rather than governance.

Related resources from NHI Mgmt Group

• Why do unmanaged privileged accounts create such a large IAM risk?
• Why do hidden accounts create such a large governance problem?
• Why do service accounts and privileged roles create governance risk even when authentication is strong?
• Why do collaboration tools create such a large secrets risk?