Who should own exposure validation when identities are involved?

Why This Matters for Security Teams

exposure validation often starts as a technical check on internet-facing assets, but the ownership question changes once an exposed path can be reached through a human, service account, API key, or agent identity. At that point, the issue is not only attack surface reduction, but also who can authenticate, what they can do, and whether the path is still valid under current governance. Security teams that treat this as a pure vulnerability-management task usually miss the identity layer.

That gap matters because exposed systems are frequently reachable through multiple trust paths, including delegated access, stale credentials, or over-privileged non-human identities. Current guidance from NIST’s Cybersecurity Framework supports cross-functional ownership of risk, rather than isolating it in one team. In practice, the decision owner should be the group that can actually remove or constrain the path, while offensive security validates whether the path is exploitable and identity governance confirms whether the identity should exist at all.

In practice, many security teams encounter exposure only after a credentialed path is abused from a system that looked “already known” in inventory, rather than through intentional identity review.

How It Works in Practice

The cleanest operating model is to split duties without splitting accountability. Offensive security should validate whether the exposure is reachable and whether the path can be chained into access. Cloud or platform teams should fix the infrastructure exposure, such as public routing, permissive security groups, or weak network controls. Identity governance, IAM, and NHI owners should determine whether the associated identity is legitimate, necessary, and constrained enough to remain in place.

For identities involved in the path, the key question is not only “is this system exposed?” but “which identity can use that exposure, under what conditions, and with what blast radius?” That includes service accounts, workload identities, API keys, certificates, and agent credentials. If the identity has standing access, over-broad RBAC, or no clear owner, the remediation should include entitlement review, secret rotation, and removal of unnecessary trust paths. The NIST CSF 2.0 is useful here because it reinforces governance, asset visibility, and protective controls as connected outcomes rather than separate silos.

A practical workflow usually looks like this:

• Confirm whether the exposure is externally reachable and whether it is actually exploitable.
• Map every identity that can reach the exposed system, including machine identities and automation accounts.
• Assign the remediation owner based on the control that can remove the risk fastest.
• Escalate to IAM or NHI governance when the identity itself is the weakest link.
• Validate closure with retesting, logging review, and entitlement verification.

Where agentic AI is involved, identity ownership becomes even more important because tool access may be delegated through service credentials or scoped tokens. Emerging guidance from the CISA Zero Trust Maturity Model supports verifying access continuously, which is especially relevant when autonomous software can initiate actions on behalf of a controlled identity. These controls tend to break down when identity inventories are incomplete and cloud teams cannot trace a path back to the specific account, key, or agent that used it.

Common Variations and Edge Cases

Tighter exposure governance often increases coordination overhead, requiring organisations to balance faster remediation against stricter ownership and review. That tradeoff is real when incidents span multiple teams, but it is better than assigning everything to the team that merely found the issue.

There is no universal standard for this yet, especially in environments where platform teams manage infrastructure, product teams own deployment pipelines, and identity teams own policy but not execution. In those cases, the right answer is usually a RACI-style model with one decision owner and several required contributors. The decision owner should be the team that can close the exposure without creating new trust gaps. If the issue is a public endpoint with a valid secret behind it, IAM and NHI governance must approve the identity remediation, not just the network change.

Edge cases include third-party integrations, ephemeral workloads, and agentic systems that generate or consume secrets dynamically. Those situations often need additional evidence from logs, token issuance records, and configuration state. If personal data, regulated workloads, or financial systems are involved, it is also reasonable to align the process with Anthropic’s report on AI-orchestrated cyber espionage as a reminder that identity-mediated access can be abused at scale, even when the initial exposure looks routine.

The model breaks down most often in hybrid estates where asset ownership is unclear, secrets are shared across teams, and no one can prove which identity actually used the exposed path.

Related resources from NHI Mgmt Group

• How should organisations govern pipeline identities that influence supply chain exposure?
• How should security teams govern non-human identities at scale?
• How should security teams govern non-human identities for compliance?
• Why do non-human identities create more audit risk than human accounts?