Shared credentials remove individual accountability, which makes both auditing and incident investigation weak. If multiple people use the same account, agencies cannot prove who did what or cleanly revoke access when a contract ends. For regulated environments, that is a governance failure because access must be attributable, scoped, and revocable.
Why This Matters for Security Teams
Shared vendor credentials look convenient, but they collapse the control evidence that regulated environments depend on: attribution, scope, and revocation. When one account is reused across people or contractors, audit logs show only the shared identity, not the human behind the action. That weakens investigations, complicates access reviews, and can leave terminated access active long after a contract ends.
This is why guidance from the OWASP Non-Human Identity Top 10 treats credential handling as a security boundary, not an admin convenience. It also aligns with NHIMG’s analysis of Ultimate Guide to NHIs — Regulatory and Audit Perspectives, which frames revocability and accountability as core governance requirements. In practice, many security teams encounter the compliance failure only after a vendor account is reused in an incident, rather than through intentional access design.
How It Works in Practice
Compliance breaks down because shared credentials bypass the normal identity lifecycle. A proper control model expects one identity per person, explicit approval, and logs that tie every action to a named operator. Shared accounts erase that link. Even if the activity is logged, the record usually proves only that the vendor account acted, not which employee used it, from where, or under whose approval.
That makes several common obligations difficult to satisfy in audits and incident response:
- Access reviews cannot verify whether the right person still needs access.
- Offboarding cannot cleanly remove a single user without disabling everyone else.
- Segregation of duties becomes difficult to enforce when multiple operators share the same login.
- Evidence collection becomes ambiguous because logs and tickets no longer map to an individual.
Current guidance from the NIST Cybersecurity Framework 2.0 and NIST SP 800-63 Digital Identity Guidelines supports unique identity, traceability, and strong lifecycle control. For NHI-adjacent cases, NHIMG’s Guide to the Secret Sprawl Challenge shows how shared secrets often persist in scripts, email, and messaging tools after the original business need has changed. A stronger model is individual named access, just-in-time elevation, and secret issuance that is tightly scoped, short-lived, and revocable.
Where possible, teams should separate vendor access into individual accounts, use federated identity or delegated access, and require session-level logging with approval context. Shared logins should be treated as a temporary exception with a documented expiry and compensating controls. These controls tend to break down in legacy remote-support environments because the tooling was built for convenience first and attributable access second.
Common Variations and Edge Cases
Tighter access controls often increase operational overhead, requiring organisations to balance auditability against vendor support speed. That tradeoff is real, especially for break-fix providers, offshore support desks, and systems that still depend on old remote administration workflows.
Best practice is evolving, but current guidance suggests avoiding blanket approvals for “vendor admin” accounts and instead using named identities, per-user MFA, and time-bounded access. In some environments, a shared emergency account may still exist for resilience, but it should be heavily controlled, separately monitored, and excluded from routine work. There is no universal standard for this yet, but the direction is clear: shared credentials should not be the normal operating model.
NHIMG research on the 2024 ESG Report: Managing Non-Human Identities found that 72% of organisations have experienced or suspect a breach of non-human identities, which is a reminder that weak identity boundaries tend to become incident evidence. Shared credentials also amplify secret sprawl, so the lessons in the Ultimate Guide to NHIs — Static vs Dynamic Secrets apply directly: the longer a credential is reused, the harder it becomes to prove who used it and why.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and NIST SP 800-63 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Shared credentials weaken NHI lifecycle control and revocation. |
| NIST CSF 2.0 | PR.AC-1 | Unique identity and access traceability support compliance evidence. |
| NIST SP 800-63 | Digital identity guidance favors attributable, strongly authenticated access. |
Replace shared secrets with unique, revocable identities and track every credential to a single owner.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on June 25, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
