Topic starter
12/05/2026 7:45 pm
TL;DR: Idle API keys, tokens and service accounts can remain valid for months or years after they stop being used, creating silent access paths that evade traditional monitoring and rotation controls, according to Entro Security's analysis of NHI sprawl. Lifecycle governance matters because forgotten credentials turn into persistent attack surface.
Editorial analysis by NHI Mgmt Group, based on content published by Entro Security: “NHI Threats & Mitigation Part 3: Idle Secrets and NHIs”.
By the numbers:
- NHIs outnumber human identities by 25x to 50x in modern enterprises, according to the Ultimate Guide to NHIs.
Key questions
Q: What breaks when idle NHI secrets are not rotated or revoked?
A: When idle secrets are not rotated or revoked, the organisation loses the distinction between active and abandoned access.
Q: Why do service accounts and API tokens create more risk when they are long-lived?
A: Long-lived service accounts and API tokens create more risk because exposure and exploitation can happen long before defenders notice.
Q: How do security teams know if NHI controls are actually working?
A: Look for complete inventory coverage, clear ownership, enforced rotation, and evidence that unused credentials are removed on time.
Practitioner guidance
- Implement secret expiration by default Require API keys, tokens, certificates, and service account credentials to expire automatically unless a documented exception is approved and reviewed.
- Track NHI creation, use, and ownership metadata Maintain an inventory that records creation time, last used time, owner, and business purpose so idle credentials can be identified before they become liabilities.
- Extend offboarding to machine credentials Add revocation and rotation steps for service accounts, tokens, and automation keys whenever the human owner leaves or the workload is retired.
Bottom line: Idle NHI secrets remain dangerous because they stay valid after the business use case disappears, creating standing access for attackers.
Explore further
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This topic was modified 1 week ago by NHI Mgmt Group
12/05/2026 7:46 pm
Idle secret debt is a lifecycle failure, not a visibility problem: Secrets that remain valid after use stops create a hidden access estate that traditional human-centric IAM processes do not close down. The central issue is that ownership, expiration, and revocation are not being enforced at the point where machine access becomes obsolete. That turns unused credentials into standing risk rather than dormant inventory. Practitioners need to treat unresolved lifecycle state as exposure, not backlog.
A few things that frame the scale:
- 1 in every 1,000 non-human identities in enterprise environments is more than 10 years old.
A question worth separating out:
Q: What should teams do when a former employee may have left active NHI credentials behind?
A: Treat the situation as an identity offboarding issue, not just a personnel issue. Reconstruct which tokens, service accounts, and keys were created for that work, verify ownership, revoke anything unnecessary, and rotate any credential that must remain in service under a current owner.
👉 Read our full editorial: Idle secrets and NHI sprawl create long-lived access risk
This post was modified 1 week ago by NHI Mgmt Group