The separation between identity governance and network access breaks down. A leaked VPN pre-shared key can allow an attacker to join a trusted site-to-site connection and move from cloud control-plane access into internal network reach. That makes the secret itself part of the identity attack surface, not a separate issue.
Why This Matters for Security Teams
When VPN secrets are exposed through identity permissions, the boundary between “who is allowed in” and “what network can be reached” collapses. A pre-shared key, device cert, or other VPN secret is not just a connectivity token; it becomes an identity artifact that can be reused, shared, or harvested from the same places analysts inspect for accounts and roles. That is why the issue belongs in NHI governance, not just network operations.
This pattern shows up in secrets sprawl, over-permissioned admin paths, and weak separation between cloud control-plane access and internal connectivity. NHI Management Group’s Ultimate Guide to NHIs notes that 97% of NHIs carry excessive privileges, which helps explain how a single exposed secret can become a broad internal foothold. The OWASP Non-Human Identity Top 10 frames the same risk as an identity problem, not a perimeter problem.
In practice, many security teams encounter this only after an attacker has already used a leaked VPN secret to blend into trusted traffic and pivot beyond the initial cloud account compromise.
How It Works in Practice
The failure starts when VPN access is treated as a reusable entitlement tied to an identity record, yet the secret that proves that entitlement is handled like an ordinary credential. If an attacker obtains that secret through IAM permissions, a misconfigured vault, a log, or a repository leak, the secret can authenticate the attacker directly into a trusted network path. From there, the attacker is no longer limited to the original identity session; they can reach internal services, admin interfaces, and sometimes even management planes that were assumed to be isolated.
That is why current guidance suggests treating VPN secrets as high-risk NHI material. Store them in controlled secret systems, scope read access narrowly, rotate them aggressively, and revoke them automatically when the service or site-to-site relationship changes. The 52 NHI Breaches Analysis and the State of Secrets Sprawl 2025 both reinforce the same operational lesson: exposure often happens through mundane pathways, not exotic exploits. GitGuardian’s research shows 96% of organisations store secrets outside secrets managers in vulnerable locations, which is exactly the kind of hygiene gap that turns a VPN secret into an identity breach.
- Separate IAM permissions for secret retrieval from permissions that grant network connectivity.
- Use short-lived, per-session or per-site credentials wherever the VPN design allows it.
- Bind access to device posture, workload identity, or certificate state instead of static shared secrets.
- Audit who can read, export, or replicate VPN secrets across CI/CD, ticketing, and chat systems.
- Revoke both the secret and the network path when ownership or trust changes.
These controls tend to break down in hybrid environments where legacy VPN concentrators, static shared keys, and broad helpdesk access are still required for business continuity.
Common Variations and Edge Cases
Tighter control of VPN secrets often increases operational overhead, requiring organisations to balance stronger isolation against support complexity and outage risk. That tradeoff is real in environments with third-party administrators, disaster recovery tunnels, or shared site-to-site links that were built before modern identity controls existed.
There is no universal standard for this yet, but best practice is evolving toward treating network secrets as part of the identity lifecycle. That means lifecycle ownership, expiry, rotation, and offboarding must all be explicit. If a VPN secret is embedded in automation, the better pattern is to replace it with workload identity or a brokered short-lived credential rather than leaving a long-lived shared key in place. This is consistent with NHI security guidance in the Ultimate Guide to NHIs and with the identity-centric framing in the OWASP Non-Human Identity Top 10.
Edge cases appear when the secret is not the only trust factor. For example, some VPNs also rely on device certificates, MFA, or allowlists. Those extra checks reduce exposure, but they do not eliminate the core problem if the secret itself can be retrieved through identity permissions. The control fails most sharply when internal trust is broad, logs are noisy, and the same identity can both read the secret and use it without additional runtime checks.
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 and CSA MAESTRO address the attack and risk surface, while NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Addresses weak secret handling and rotation for non-human identities. |
| CSA MAESTRO | Covers agent and workload trust boundaries that VPN secrets can bypass. | |
| NIST AI RMF | Supports governance for context-aware access decisions and lifecycle risk management. |
Apply risk governance to secret retrieval, expiry, and revocation across the full identity lifecycle.
