What should organisations do first when service accounts are not yet under control?

The first move is to discover every service account, then identify which ones are essential and who owns or uses them. Once the inventory is clear, re-certify each account, remove unnecessary entries, and tighten credential handling so secrets are not left in scripts or files. That sequence creates the baseline needed for least privilege, access reviews, and audit readiness.

Start with discovery, then separate what is real from what is merely present

When service accounts are not under control, the first useful move is not policy writing or credential rotation in isolation, it is discovery. Organisations need a complete inventory that shows every account, where it runs, what it touches, and whether it is still required. Without that baseline, access reviews, ownership assignment, and remediation are all guesses.

That discovery pass should also establish which accounts are active, shared, hidden in code or automation, or tied to systems no one still supports. A practical inventory is not just a list of names, it is a control map for identity, privilege, and dependency.

A useful starting point is the broader NHI lifecycle and governance view in Ultimate Guide to NHIs, which frames discovery as the foundation for everything that follows.

Re-certify ownership and remove anything that lacks a clear business need

Once the inventory exists, the next step is to validate ownership and necessity. Every service account should have a named owner, a documented purpose, and a current system dependency. If no one can explain why an account exists, that account is already a governance problem and should move into review or retirement.

Re-certification matters because unmanaged service accounts tend to accumulate stale access, duplicated permissions, and orphaned secrets. The goal is to shrink the set before tuning it. Organisations usually get better results by removing unnecessary accounts and dependencies early, then tightening the remainder, rather than trying to secure an oversized sprawl first.

Confirm which accounts are still used by production workloads.
Flag duplicate, dormant, or unowned accounts for removal.
Record the system, application, or team that depends on each remaining account.

For a practical view of how sprawl, ownership gaps, and excessive permissions show up in real environments, see Top 10 NHI Issues and Ultimate Guide to NHIs, Key Challenges and Risks.

Lock down credential handling before you optimise anything else

After inventory and ownership, the next priority is credential hygiene. Service account secrets should not live in scripts, config files, ticket comments, or shared drives. They need rotation, expiry where feasible, and a controlled vaulting or injection pattern so exposure is reduced even when code or infrastructure is inspected.

This is where organisations should treat “working today” as a weak standard. A service account that functions but has embedded secrets, broad standing privilege, or no rotation discipline is still uncontrolled. The shortest path to better posture is to reduce where secrets are stored, reduce who can retrieve them, and reduce how long they remain valid.

Move long-lived secrets out of code and files.
Rotate credentials for any account that is still needed.
Use the inventory to set a remediation order by exposure and privilege.

NHIMG’s Why NHI Security Matters Now and The 2025 State of NHIs and Secrets in Cybersecurity reinforce why unmanaged credentials and overprivilege are still high-impact failure modes, and the PCI DSS v4.0 document library is a useful external reference where least privilege and account controls need to be demonstrated formally.

Risk and Threat Considerations

Uncontrolled service accounts create concentrated exposure because they often have broad access, long-lived credentials, and weak visibility. If attackers find one exposed secret or overprivileged account, they can move from simple access to persistence, lateral movement, or data access without needing a human login.

Failure mechanism: The control failure is usually a combination of missing inventory, stale ownership, and secrets embedded in places that are easy to copy but hard to monitor. That makes compromise durable, because rotation and revocation are slow when no one can first identify the full set of accounts affected.

Impact: The result is avoidable blast radius, delayed containment, and weak audit evidence. In practice, this can turn a single leaked credential into repeated access across systems, environments, or third-party integrations.

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 surface, NIST CSF 2.0 and CIS Controls v8 set the technical controls, and PCI DSS v4.0 define the regulatory obligations.

Framework	Control / Reference	Relevance
OWASP Non-Human Identity Top 10	NHI-01 — Discovery and Inventory	Discovery and inventory are the first step when service accounts are uncontrolled.
	NHI-02 — Secrets and Credential Management	The answer stresses removing secrets from scripts and tightening credential handling.
	NHI-03 — Privilege and Access Governance	Recertifying accounts and removing unnecessary entries directly reduces excess privilege.
Recommendation — Inventory every service account and assign an owner before attempting cleanup. Move service-account secrets into managed storage and rotate exposed credentials. Re-certify active service accounts and remove any unnecessary access.
NIST CSF 2.0	ID.AM — Asset Management	An inventory of service accounts is an asset-management task needed to restore control.
	PR.AC — Identity Management, Authentication and Access Control	Least privilege and access reviews are central to controlling service accounts.
Recommendation — Maintain a complete inventory of service accounts and their dependencies. Apply least-privilege access controls and review account permissions regularly.
CIS Controls v8	5 — Account Management	Account discovery, ownership, review, and removal map directly to account management.
	6 — Access Control Management	Tightening service-account access and reducing standing privilege is an access-control task.
Recommendation — Establish accountable ownership and remove accounts that are no longer required. Restrict service-account permissions to the minimum needed for each workload.
PCI DSS v4.0	7 — Restrict Access by Business Need to Know	Least privilege and removal of unnecessary account access align with business-need access restriction.
	8.6 — System and Application Accounts and Authentication Management	System and application account handling directly matches service-account control and secret handling.
Recommendation — Limit service-account access to the systems and data the workload truly needs. Manage system accounts explicitly and rotate credentials on a defined schedule.

Practitioner Guidance

What to prioritise: Start with the accounts that have production reach, broad permissions, or secrets stored outside a managed vault. Those are the fastest path to meaningful risk reduction because they combine visibility gaps with immediate blast-radius potential.

What to verify: Before trusting the cleanup, verify that each surviving service account has a current owner, a real dependency, and an explicit reason it still exists. If any of those three are missing, the account should be treated as unresolved rather than controlled.

Practitioner takeaway: The right first move is to build a trustworthy inventory and ownership map before attempting deeper optimisation, because you cannot enforce least privilege or safe rotation on identities you have not yet found.