How should organisations respond when an authenticated identity starts behaving outside its baseline?

Why This Matters for Security Teams

When an authenticated identity suddenly departs from its normal pattern, the immediate risk is not just misuse of one account. It is the collapse of trust in everything that account can reach: delegated sessions, API calls, downstream tooling, and hidden automation chains. NHI Management Group’s Ultimate Guide to NHIs shows why this matters at scale: 80% of identity breaches involved compromised non-human identities such as service accounts and API keys, and 97% of NHIs carry excessive privileges.

Security teams often overfocus on the resource touched first, such as a storage bucket, SaaS tenant, or Kubernetes namespace. That misses the more dangerous path: the identity itself may still be active, still trusted, and still able to pivot. NIST’s Security and Privacy Controls reinforce the need to contain, monitor, and revoke compromised access paths rather than treat every event as a simple endpoint incident. In practice, many security teams encounter the full blast radius only after the identity has already chained permissions across systems and left the original alert behind.

How It Works in Practice

The right response is to contain the identity path first, then investigate the affected assets. That means suspending active sessions, revoking bearer tokens, disabling delegated access, and forcing re-authentication or key rotation where the identity uses long-lived secrets. For service accounts and machine users, containment should include the workload that issued the credentials, the vault or CI/CD pipeline that supplied them, and any trust relationships that allow the identity to act elsewhere.

A practical workflow usually follows three steps:

• Freeze the identity’s effective permissions at runtime, including SSO sessions, API tokens, and cloud role assumptions.
• Preserve telemetry for the full action timeline, including auth events, privilege changes, tool invocations, and outbound connections.
• Review whether the identity is human-operated, service-owned, vendor-managed, or an AI agent, because the response differs by control plane.

This aligns with the broader containment thinking in the 52 NHI Breaches Analysis, where delayed revocation and weak visibility repeatedly amplify incident scope. It also fits the NIST Cybersecurity Framework 2.0 guidance on identifying, protecting, detecting, and responding across identity-dependent assets, not only the final target. The operational goal is to stop the identity from continuing to act while keeping enough evidence to reconstruct every action it took.

These controls tend to break down when the identity is embedded in automated pipelines that cannot tolerate interruption, because teams hesitate to revoke access before they understand all dependent jobs and services.

Common Variations and Edge Cases

Tighter containment often increases operational disruption, requiring organisations to balance rapid shutdown against business continuity. That tradeoff is especially sharp for vendor accounts, ephemeral cloud roles, and AI agents that may be performing legitimate multi-step work. Current guidance suggests prioritising the identity path over the individual resource, but there is no universal standard for how aggressively to stop automation without breaking critical processes.

For vendor-managed identities, the response should include contract-aware escalation, because the organisation may need the provider to rotate credentials or reissue keys. For AI agents, the problem is broader: the agent may have tool access, chain-of-command permissions, and dynamic prompts that make the next action impossible to predict. In those cases, containment should include the execution environment, not only the token. For high-value service accounts, a full offboarding or JIT replacement may be safer than trying to preserve the session.

This is also where poor visibility creates false confidence. NHI Management Group’s Top 10 NHI Issues highlights how missing ownership, weak rotation, and scattered secrets make identity-based containment slower than it should be. The best practice is evolving toward identity-centric response playbooks that treat every authenticated workload as revocable, observable, and time-bounded by design.

Related resources from NHI Mgmt Group

• When should organisations prioritise Zero Standing Privilege for non-human identities?
• What is the difference between code scanning and runtime identity monitoring?
• How can organisations reduce secret leakage in ServiceNow at scale?
• How do organisations reduce false positives in secret detection pipelines?