Who is accountable when shared credentials are used across teams?

Why This Matters for Security Teams

Shared credentials across teams create a single accountability gap: once a secret is reused by multiple people, no one can prove who used it, why it was used, or whether it should still exist. That matters because offboarding, incident response, and access reviews all depend on a named owner and a revocation path. NHI Management Group’s research on the Guide to the Secret Sprawl Challenge shows how quickly shared secrets drift out of control when distribution is informal.

The practical issue is not just policy. Shared credentials undermine auditability, encourage copy-and-paste access patterns, and make it difficult to distinguish legitimate use from abuse. Current guidance suggests that accountability should follow service ownership, not whoever touched the credential last. That is consistent with the control intent behind the OWASP Non-Human Identity Top 10, which treats unmanaged secrets as an identity risk, not a convenience feature. In practice, many security teams discover the ownership problem only after a contractor leaves or an incident review exposes that the same credential lived in several team chats.

How It Works in Practice

Accountability should be assigned to the service owner or platform owner because they control the lifecycle of the credential, the system that consumes it, and the evidence needed for review. Day-to-day users may operate the secret, but they rarely own its purpose, rotation, or retirement. The control model should therefore separate usage from stewardship.

A workable approach is to attach every shared credential to a named asset owner, a ticketed business purpose, and a logging source that records use at the system boundary. Where possible, replace the shared secret with a workload identity or a delegated access pattern so each team, job, or service can be traced separately. NHI Management Group’s 2024 Non-Human Identity Security Report notes that 23.7% of organisations still share secrets through insecure methods such as email or messaging applications, which is exactly the kind of practice that breaks ownership tracing.

• Assign one accountable owner for the service, not a committee or rotation.
• Record where the secret is used, who approved it, and what business function it supports.
• Use scoped logging so teams can prove usage without exposing the secret itself.
• Define a revocation path that the owner can execute immediately during offboarding or incident response.
• Prefer unique credentials per system or team when the platform supports it.

For identity assurance and audit traceability, the NIST SP 800-63 Digital Identity Guidelines reinforce the need for verifiable identity evidence and lifecycle governance, even though shared machine access is not a human login problem. These controls tend to break down in fast-moving DevOps environments where teams trade secrets informally to keep releases moving because ownership and approval records are missing at the moment they are most needed.

Common Variations and Edge Cases

Tighter credential ownership often increases operational overhead, requiring organisations to balance traceability against deployment speed. That tradeoff is real when legacy systems, vendor integrations, or batch jobs cannot yet support per-user or per-workload identity.

Best practice is evolving, but current guidance suggests that if a shared credential must exist, its owner should still be the only party responsible for rotation, revocation, and exception handling. In some environments, multiple teams may use the same service account while different platform groups manage infrastructure. In that case, accountability should stay with the team that can actually change the credential and answer for its exposure, not with the team that merely relies on it.

There are also edge cases where accountability is contractual rather than operational, such as third-party managed services or shared vendor-run automation. In those situations, the internal owner must still exist so the organisation has someone to challenge, escalate to, and decommission through. For teams dealing with sprawl across repositories, pipelines, and messaging tools, the Guide to the Secret Sprawl Challenge is a useful reminder that hidden distribution channels often matter more than the credential itself. This model becomes brittle when ownership is split across multiple departments with no single party able to revoke access quickly.

Related resources from NHI Mgmt Group

• Who is accountable when shared access is used across critical operations?
• How should security teams govern shared data definitions across BI and AI tools?
• How should security teams make NHI best practices usable across the business?
• How should security teams govern API keys used for generative AI access?