What breaks when on-call access is granted manually during incidents?

Why This Matters for Security Teams

Manually granting on-call access during an incident looks practical, but it breaks the control model that keeps emergency privilege bounded. The moment approval moves to chat, ticket comments, or ad hoc verbal sign-off, teams lose consistent expiry, auditable scope, and reliable revocation. That is especially risky for secrets, service accounts, and incident responders who may need access only long enough to restore service. NHI Management Group’s Ultimate Guide to NHIs shows how widespread this problem is, while the OWASP Non-Human Identity Top 10 frames overprivilege and weak lifecycle controls as persistent identity risks.

The real issue is not the emergency itself. It is that manual access often becomes the fastest path to standing privilege, bypassing the guardrails that should make incident access temporary, reviewable, and automatically removed. In practice, many security teams encounter excessive access only after an outage has already expanded into a post-incident investigation.

How It Works in Practice

Incident access works best when it is treated as a time-bound, policy-driven event rather than a human favour. For human responders, that usually means JIT approval with explicit task scope, short TTLs, and automatic revocation at closure. For autonomous or semi-autonomous remediation workflows, the same principle applies to workload identity: the system should prove what it is and what it is allowed to do at request time, not inherit broad standing access.

Practically, that means replacing manual permissioning with controls such as:

• Pre-approved incident roles that map to a narrow set of actions, not blanket admin rights.
• JIT elevation with expiry timers, so access ends even if the incident thread does not.
• Immutable logs that record who approved access, why, when it started, and when it ended.
• Central policy evaluation for each request, rather than one-time approval that remains valid throughout the outage.
• Secret delivery from a vault or identity broker, never by sharing static credentials in chat or tickets.

This model aligns with current guidance in the OWASP Non-Human Identity Top 10 and with NHI lifecycle guidance in The 2024 ESG Report: Managing Non-Human Identities, which highlights how often compromised NHIs and weak governance compound operational risk. It also fits the broader direction of zero trust, where access is continually re-evaluated instead of assumed. These controls tend to break down when incident response depends on shared break-glass credentials in high-churn environments because revocation becomes delayed, partial, or impossible to prove.

Common Variations and Edge Cases

Tighter emergency access often increases coordination overhead, requiring organisations to balance operational speed against auditability and blast-radius reduction. That tradeoff is real, especially when incident severity is high and every minute matters. Best practice is evolving here, and there is no universal standard for every incident model yet.

Some teams still keep break-glass accounts for true outages, but those accounts should be heavily monitored, isolated, and tested on a schedule. Others use delegated approval chains or automated incident policy engines, which reduce friction but require strong ownership and clean integration with ITSM, PAM, and secrets management. The key edge case is multi-team incidents: if access is granted in one channel and revoked in another, the organisation may believe privilege has ended when it has not. That is where manual processes usually fail hardest.

NHI Management Group’s 52 NHI Breaches Analysis is a useful reminder that identity failures often cascade once controls become informal, and the OWASP Non-Human Identity Top 10 remains the clearest reference for reducing that exposure. Manual on-call access is most fragile in containerised, CI/CD-heavy, or cross-cloud environments because the responder can lose track of which credentials, tokens, and sessions are still active.

Related resources from NHI Mgmt Group

• What breaks when access reviews are based only on granted permissions?
• What breaks when AWS access is granted through broad admin roles?
• What breaks when DNS administration is not governed as privileged access?
• What breaks when DNS access is not tied to ownership and offboarding?