Who is accountable when shared service accounts or API keys are left exposed?

Why This Matters for Security Teams

Exposed shared service accounts and API keys are not just a secret-management problem; they are an accountability problem that turns into an incident response problem. When several teams can use the same credential, no one can prove who last used it, who should rotate it, or who is authorised to revoke it. That ambiguity slows containment and makes ownership disputes more likely than timely action.

In practice, the risk is amplified because exposed credentials are often discovered by attackers within minutes, not days. NHI Management Group has highlighted how rapidly publicly exposed AWS credentials are probed in the LLMjacking: How Attackers Hijack AI Using Compromised NHIs research, and that same pattern shows up across secret-sprawl cases documented in the Guide to the Secret Sprawl Challenge. The practical lesson is that shared credentials collapse the normal chain of custody that security teams rely on. As NIST’s Security and Privacy Controls frame it, access control only works when responsibility for the control is clear. In practice, many security teams discover the missing owner only after the credential has already been abused.

How It Works in Practice

Accountability for an exposed shared account or API key should be assigned before the credential exists, then carried through its entire lifecycle. The system owner is usually responsible for the business purpose of the access, the identity or IAM team is responsible for how the credential is issued and governed, and the security team is responsible for detection, escalation, and containment. That division is only effective if it is written down in an access model, tied to a named steward, and backed by revocation procedures that are tested, not assumed.

For shared service accounts, best practice is evolving away from persistent credentials and toward workload identity, short-lived tokens, and scoped automation. In practical terms, that means replacing a static key with per-workload identity where possible, so the credential is bound to a service instance or job rather than a group of humans. For API keys that cannot yet be removed, teams should document the owner, the consumer list, the rotation interval, the monitoring source, and the emergency revoke path. If a key is exposed, the people accountable are the ones who can rotate or disable it without waiting for committee approval.

• Define a single named steward for every shared credential, even if multiple teams use it.
• Map each key or service account to a business service, not just a technical system.
• Use JIT issuance and short TTLs wherever the platform allows it.
• Log issuance, use, and revocation events so ownership disputes can be resolved quickly.
• Test revocation in incident drills, because untested rotation is usually too slow during a live exposure.

This aligns with the lessons in the 52 NHI Breaches Analysis and with the broader pattern described in the Anthropic report on AI-orchestrated cyber espionage, where autonomous misuse depends on abused access that remains valid too long. These controls tend to break down in legacy environments with hardcoded credentials, unmanaged integrations, and no central secret inventory because no team can confidently revoke what it does not fully own.

Common Variations and Edge Cases

Tighter credential governance often increases operational overhead, so organisations have to balance faster delivery against the cost of visibility, rotation, and coordination. That tradeoff becomes sharper in shared platform teams, outsourced operations, and machine-to-machine integrations where many services depend on the same access path.

There is no universal standard for this yet, but current guidance suggests that the more widely shared a credential is, the less defensible it becomes. A common edge case is the “break-glass” account: it may be intentionally shared, but it still needs a named owner, storage controls, and a documented emergency use process. Another is third-party API access, where the vendor may provide the key but the organisation still owns the exposure risk once that secret enters its environment. The same applies to AI-era tooling, where keys may live in config files, CI/CD variables, or chat workflows. NHI Management Group’s Guide to the Secret Sprawl Challenge shows why secret location alone is not enough; governance must follow the secret wherever it spreads. For teams building stronger baselines, DeepSeek breach is a reminder that exposure often arrives through scale, not just negligence.

In short, accountability should sit with the party that can actually change the access, not the party that merely consumes it. Where that is unclear, the credential usually stays live longer than intended, especially in environments with shared admin paths, multi-team ownership, or weak revocation automation.

Related resources from NHI Mgmt Group

• What problem does ownership attribution solve for service accounts and API keys?
• What breaks when service accounts and API keys are left unrotated in AI systems?
• What breaks when AI agents rely on shared service accounts or API keys?
• Who is accountable when Claude Code access is exposed through personal accounts or unmanaged API keys?