Who should be accountable when a non-human identity is over-privileged?

A named human owner should be accountable for the identity’s purpose, lifecycle, and risk acceptance. Machine identities do not self-govern, so accountability must sit with the team that created, approved, or operationally depends on the credential. That is what turns attribution into governance.

Why This Matters for Security Teams

Over-privileged non-human identities are not a documentation problem, they are a control failure with real blast radius. When a service account, API key, or agent credential can do more than it should, the accountable human owner must be able to explain why the access exists, who approved it, and how it will be reduced. That is the difference between governance and drift, especially in environments where the Ultimate Guide to NHIs shows that 97% of NHIs carry excessive privileges.

The practical issue is that nobody can trust “shared responsibility” when the identity itself has no judgment. Security teams need a named owner because over-privilege often accumulates through temporary exceptions, copied roles, and automation that was never revisited. The OWASP Non-Human Identity Top 10 treats excessive privilege and weak lifecycle control as recurring NHI failure modes, not edge cases. In practice, many security teams encounter the risk only after a breach report, not through intentional review.

The right accountability model also matters for auditability. If no single human can approve risk acceptance, revoke access, or justify exceptions, then remediation stalls and ownership becomes political instead of operational. NHI Mgmt Group’s research also shows how often secrets and service account exposure become systemic rather than isolated, which makes clear ownership a prerequisite for cleanup.

How It Works in Practice

Accountability for an over-privileged NHI should follow the identity’s purpose, not the infrastructure it touches. The most reliable pattern is to assign one named human owner, one technical steward, and one approving business or product owner. The named owner is responsible for lifecycle decisions, the steward handles implementation, and the approver accepts residual risk when access cannot be fully removed. This keeps the question from collapsing into vague platform ownership.

Operationally, the owner should be answerable for four actions:

• Explaining why the identity exists and what business process depends on it.
• Confirming which permissions are required versus inherited by mistake.
• Ensuring rotation, expiry, or revocation happens on schedule.
• Reviewing exceptions when the identity has standing access beyond the expected scope.

This is where current guidance aligns with least privilege and Zero Trust thinking. The Ultimate Guide to NHIs — Key Challenges and Risks highlights how excessive privileges and weak visibility combine to create hidden exposure. The OWASP Non-Human Identity Top 10 reinforces that access sprawl is not resolved by inventory alone; it requires ongoing ownership and review. In practice, teams should tie ownership to IAM requests, secrets manager entries, and CMDB records so the accountable human is discoverable during incident response.

Current guidance suggests that entitlement reviews should be risk-based rather than purely calendar-based, because not every NHI carries the same blast radius. These controls tend to break down when identities are created by CI/CD pipelines without a human approver, because the owner becomes ambiguous and no one feels responsible for pruning access later.

Common Variations and Edge Cases

Tighter accountability often increases operational overhead, requiring organisations to balance speed of automation against stronger control over privilege growth. That tradeoff is real in platform engineering, where one team may provision hundreds of machine identities across services, environments, and tenants.

There is no universal standard for this yet, but best practice is evolving toward explicit ownership by use case. For example, a shared service account used by several applications still needs one accountable human, even if multiple teams rely on it. A platform team may administer the credential, but the product or service owner should usually accept the risk of excess privilege and define the business need. When that distinction is missing, remediation becomes a blame-shifting exercise instead of a control decision.

Edge cases also arise with outsourced operations, ephemeral workloads, and delegated administration. If an external partner provisions or maintains the identity, accountability still cannot be outsourced entirely; the internal sponsor must remain answerable for approving scope and reviewing access. The 52 NHI Breaches Analysis shows why this matters: once credential abuse begins, ambiguity over who owned the identity slows containment.

For incident response, the most useful question is not who technically created the secret, but who had authority to decide it should keep those permissions. That is the human who should be accountable when an NHI is over-privileged.

Related resources from NHI Mgmt Group

• Who is accountable when a non-human identity is over-privileged?
• Who is accountable when a non-human identity is over-privileged or left active after offboarding?
• Who is accountable when a privileged non-human identity causes a security incident?
• How should security teams govern non-human identities at scale?