Why do dormant and orphaned accounts become more dangerous during holiday periods?

Why This Matters for Security Teams

Dormant and orphaned account become more dangerous during holiday periods because the normal signals that trigger cleanup are weaker: fewer reviewers, slower approvals, and less reliable ownership chains. Attackers look for exactly that gap. An account that has not been used recently may still retain valid tokens, old API keys, or inherited privileges, which makes it an easier foothold than a fresh target. NHI Management Group’s Ultimate Guide to NHIs notes that 97% of NHIs carry excessive privileges, which is why unused accounts often remain dangerous even when they appear inactive. That risk is not abstract: NIST Cybersecurity Framework 2.0 treats identity governance and continuous monitoring as operational priorities, not periodic hygiene tasks. In practice, many security teams discover stale access only after a holiday incident exposes that no one owned the account anymore.

How It Works in Practice

The holiday period changes both attacker behaviour and internal control effectiveness. On the offensive side, adversaries often start with a low-noise account that appears forgotten, then use it to test access paths, enumerate systems, or pivot into higher-value services. On the defensive side, ticket queues slow down, approvers are unavailable, and ownership records become harder to validate. That combination turns dormant access into an operational blind spot.

Practitioner controls should focus on ownership, authentication validity, and privilege reality rather than account age alone. A dormant account is risky when any of the following remain true:

• It still has active credentials, API keys, or refresh tokens.
• It is mapped to a service, system, or vendor that is no longer actively managed.
• Its role grants broad access that has never been revalidated.
• It bypasses modern controls such as MFA, conditional access, or short-lived secrets.

This is why the Ultimate Guide to NHIs is relevant beyond NHI-only environments: the same lifecycle weakness applies to service accounts, script identities, shared admin accounts, and abandoned integrations. Operationally, teams should pair pre-holiday review with immediate disablement of accounts that lack a verified owner, then validate that secrets rotation and revocation actually completed. The governance pattern aligns with NIST Cybersecurity Framework 2.0 because the control objective is not just inventory accuracy, but timely removal of access that is no longer justified. These controls tend to break down in organisations with poor identity inventory, where no one can confidently distinguish an inactive account from one that is still tied to a critical batch job or third-party integration.

Common Variations and Edge Cases

Tighter dormant-account controls often increase operational overhead, requiring organisations to balance security gains against the risk of disabling something that still supports a holiday-critical process. That tradeoff is real, especially in environments with shared service accounts, unmanaged vendor access, or systems that do not expose dependable usage telemetry.

Best practice is evolving, but current guidance suggests treating high-risk dormant accounts differently from low-risk ones. For example, accounts with privileged access, external exposure, or secret material should be disabled or rotated first, while lower-risk accounts can move through a confirmation workflow. Where there is no universal standard for this yet, a practical approach is to combine inactivity thresholds with owner attestation, last-authentication data, and secret age. The real edge case is orphaned access embedded in automation: an account may look dormant to human reviewers while still being used by jobs, scripts, or integrations that were never documented. That is why holiday cleanup should include both human and machine identities, not just user mailboxes. NHI Mgmt Group’s research on Ultimate Guide to NHIs is useful here because it frames lifecycle control as a continuous discipline, not a once-a-year purge.

Related resources from NHI Mgmt Group

• Why do non-human identities create more risk than many human accounts?
• Why do non-human identities create more remediation risk than many human accounts?
• What are common vulnerabilities associated with service accounts in AI deployments?
• Why do secrets stay dangerous even when they are no longer actively used?