They often treat it as harmless because it is dormant, when it is still active privilege. Dormant access still expands blast radius and can be abused if the account, token, or agent is compromised later. If access has no recent business use, teams should treat it as a candidate for revocation or tighter scoping.
Why This Matters for Security Teams
Access that has not been used for months is often misclassified as low risk because it appears dormant, but dormant privilege is still privilege. If the credential, token, service account, or agent is later compromised, that unused access can become a ready-made path for data exfiltration, lateral movement, or tool chaining. The risk is amplified in non-human identities, where ownership is often unclear and lifecycle controls lag behind business change.
NHI Mgmt Group research shows that Ultimate Guide to NHIs reports 97% of NHIs carry excessive privileges, which makes long-idle access especially dangerous when teams assume inactivity equals safety. That pattern is also reflected in the OWASP Non-Human Identity Top 10, where weak lifecycle control and overprivilege are recurring failure modes.
Security teams get this wrong when they focus on last use dates instead of current entitlement, because access can remain fully usable long after the original business need has disappeared. In practice, many security teams encounter the abuse of “old” access only after a compromise has already turned dormant privilege into an active breach path.
How It Works in Practice
The right question is not whether access has been used recently, but whether it is still required, still scoped correctly, and still tied to a verifiable owner or workload. For human accounts, that usually means access review, recertification, and revocation. For NHIs and agents, it means lifecycle control, secret rotation, and workload identity validation so that the system knows what the entity is and what it is allowed to do at runtime.
Current guidance suggests treating months of inactivity as a trigger for review, not as evidence of safety. That review should check for:
- business justification still in force
- ownership and accountability still assigned
- scope still minimal for the current task
- secret, token, or certificate still within its intended TTL
- logs confirming the access is not being used by hidden automation
For agentic systems, static IAM rules often fail because autonomous behavior is goal-driven rather than fixed. A dormant agent credential may be unused for months and then suddenly invoked in a new chain of actions. Best practice is evolving toward runtime authorization, just-in-time issuance, and policy evaluation based on context, supported by workload identity standards such as SPIFFE and SPIRE. That approach aligns with the governance emphasis in the Ultimate Guide to NHIs — Key Challenges and Risks and with control expectations in NIST SP 800-53 Rev 5 Security and Privacy Controls.
Teams should also distinguish between inactivity and invisibility. Some access appears unused simply because logging is incomplete, the service account is shared, or the credential is stored in a pipeline that only triggers under rare conditions. These controls tend to break down in environments with shared service accounts and weak secret inventory because no one can reliably prove the access is truly idle.
Common Variations and Edge Cases
Tighter revocation often increases operational overhead, requiring organisations to balance blast-radius reduction against the risk of breaking an unseen dependency. That tradeoff is real, especially in legacy systems, batch jobs, emergency break-glass accounts, and third-party integrations where “unused” may just mean “rarely invoked.”
Best practice is evolving, and there is no universal standard for this yet, but a practical approach is to move from blanket trust to tiered handling. High-risk dormant access should be revoked or reissued with narrower scope. Lower-risk access can be retained temporarily with explicit justification, stronger monitoring, and scheduled revalidation. The decision should be based on sensitivity, owner confidence, and whether the access is tied to a human, service account, or autonomous agent.
This is where dormant access becomes especially important for NHI programs. The same credential may sit untouched for months and still be embedded in code, CI/CD, or orchestration logic. NHI Mgmt Group notes in 52 NHI Breaches Analysis that this kind of hidden exposure repeatedly turns into real incidents, especially when secrets are left valid long after business need has ended. The practical response is to shorten TTLs, verify ownership, and remove entitlement by default unless a current use case is documented and monitored.
When access has not been used for months, the safe assumption is not that it is harmless, but that it is unexamined. That distinction matters most when a dormant credential is also a high-privilege NHI or an agent with tool access.
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, OWASP Agentic AI Top 10 and CSA MAESTRO address the attack and risk surface, while NIST CSF 2.0 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Dormant access often reflects weak rotation and revocation discipline. |
| OWASP Agentic AI Top 10 | A-05 | Agents can reuse stale privileges unpredictably after long idle periods. |
| CSA MAESTRO | IAM-02 | Agent identity and entitlement need continuous validation, not static approval. |
| NIST CSF 2.0 | PR.AC-1 | Access should be limited to authorised users and systems only while needed. |
| NIST AI RMF | AI systems require governance for changing access behaviour and downstream impact. |
Tie autonomous access to workload identity, task scope, and explicit expiry before granting execution authority.
