How should security teams implement on-call access without creating standing privilege?

Why This Matters for Security Teams

On-call access fails when it is treated like a durable role instead of a time-bound operational state. For production support, the risk is not just over-privilege, but privilege that lingers after the responder is no longer responsible. NHI Management Group’s Ultimate Guide to NHIs notes that 97% of NHIs carry excessive privileges, which is exactly why standing access creates unnecessary blast radius.

Security teams also need to account for how privilege is activated, approved, and removed in real time. The OWASP Non-Human Identity Top 10 frames over-privilege and poor lifecycle control as common failure modes, and the same pattern appears in on-call workflows when access is granted through static group membership or manual exceptions. In practice, many teams discover the access problem only after an incident review shows a responder still had production rights long after the duty window ended.

How It Works in Practice

The strongest pattern is to bind access to an authoritative on-call signal, then treat that signal as the source of truth for granting and revoking privilege. That can be a pager system, ITSM assignment, or HR-linked duty schedule, but the access control decision should happen at request time, not by preloading users into permanent admin groups. This aligns with least privilege and with the operational reality that on-call is temporary, not a job title.

In practice, security teams should combine several controls:

• Issue JIT access only when the on-call signal is active and the ticket or incident context is valid.
• Use short-lived tokens or temporary group membership with explicit expiry, not manual removal later.
• Require MFA and step-up approval for sensitive production actions, especially break-glass use.
• Log both the grant and the removal so audit evidence shows who had access, when, and why.
• Automate revocation when the shift ends, the ticket closes, or the on-call assignment changes.

For NHI-heavy environments, the same model should extend to service accounts, automation jobs, and human responders who operate production tooling. The State of Non-Human Identity Security highlights how weak visibility and over-privilege still drive risk, while current guidance from NIST Cybersecurity Framework 2.0 and NIST SP 800-207 Zero Trust Architecture supports continuous verification rather than trust based on prior membership.

These controls tend to break down when identity and access systems cannot ingest on-call state in real time, because revocation becomes manual and temporary privilege quietly turns into standing privilege.

Common Variations and Edge Cases

Tighter on-call access often increases operational overhead, requiring organisations to balance incident response speed against the cost of more automation and stricter approval logic. There is no universal standard for this yet, but current guidance suggests that break-glass access should be narrower than normal support access and reserved for exceptional cases only.

One common edge case is multi-team coverage, where a responder may be on-call for one service but not another. In that scenario, access should be scoped by system, environment, and duty window, not by broad org-level role. Another is third-party support, where temporary access should be issued through the same JIT workflow and should expire without relying on vendor discipline alone. The 52 NHI Breaches Analysis is useful here because it shows how quickly weak lifecycle controls become an incident pattern.

For agentic or automation-heavy operations, teams should be careful not to map on-call access directly to long-lived secrets or broad API tokens. Best practice is evolving toward short-lived credentials, policy checks at runtime, and explicit removal of access when the duty state changes. This is the right model when the access need is intermittent, but it can be harder to implement in legacy systems with static RBAC and no reliable event feed from scheduling tools.

Related resources from NHI Mgmt Group

• How should security teams implement just-in-time access without leaving standing privilege behind?
• How should IAM teams implement attribute-based access control without creating access sprawl?
• How should security teams implement SCIM without creating more access risk?
• How should security teams automate database access without creating new privilege creep?