Open Charge Point Interface (OCPI) is a protocol for exchanging data between electric vehicle charging networks and related service providers. Security teams care because it carries operational and sometimes customer-linked information across organisational boundaries. Review authentication, certificate handling, message integrity, and partner onboarding, and restrict what data each party can exchange.
What Security Teams Need to Notice About OCPI Traffic
OCPI is not just a business integration layer. It is a trust boundary between organisations, so the security questions are about who can exchange data, how that exchange is authenticated, and what happens if a partner or connector is weak. That makes OCPI relevant to teams that own API security, partner risk, data classification, and monitoring.
The practical issue is that OCPI often moves information that is operationally sensitive even when it is not obviously confidential. Charging location data, availability, pricing, session details, and related customer context can be enough to reveal business operations or user behaviour. If that data crosses organisations, the security review must focus on the interface, not just the applications on either side.
For teams assessing the interface itself, the useful questions are whether endpoints are segmented by partner, whether certificates and tokens are scoped to the minimum required trust relationship, and whether message-level controls prevent tampering or replay. Open integrations often fail at the edges, where partner onboarding, certificate rotation, and schema validation are treated as integration work rather than security controls. Cloud Misconfiguration Guide is useful here because the same failure pattern appears when external trust boundaries are left too open, too static, or too loosely governed.
Where OCPI Creates Risk in Real Deployments
The main risk is not that OCPI exists, but that it can become a durable external dependency with broad reach. If one partner is over-trusted, a compromise can expose data flow, enable unauthorized requests, or let an attacker abuse a legitimate integration path. In practice, that means the interface should be treated like any other externally exposed service with tight trust boundaries and narrow permissions. NIST Cybersecurity Framework 2.0 is a useful framing reference because OCPI touches governance, protection, detection, response, and recovery, not just build-time configuration.
Failure mechanism: Weak partner onboarding, stale certificates, overbroad scopes, or poor request validation can let an untrusted party look legitimate long enough to read, alter, or replay data. If security teams do not continuously review those trust assumptions, a small integration weakness can become a cross-organisation exposure.
Impact: The likely consequences are data leakage, integrity loss in operational charging information, disputed transactions, and difficulty attributing whether a bad request came from a legitimate partner account or a compromised integration path. In regulated or high-trust environments, that can also create audit and incident-response friction.
How to Review OCPI Without Slowing the Integration Down
The right review approach is to separate transport trust, partner identity, and payload trust. Authentication should prove the counterparty, but that is not enough on its own. Teams should also verify certificate handling, request signing or equivalent integrity protections where used, and whether the schema and authorization model actually limit what each party can see or change. For modern API-style integrations, OWASP API Security Top 10 is a good companion because OCPI shares the same broken-authentication, broken-authorization, and inventory problems that affect many partner APIs.
What matters most is not whether the protocol is “secure by design” in the abstract, but whether your deployment uses short-lived, well-scoped trust and explicit partner inventory. If a partner integration can be created once and then left untouched for months, the real control gap is lifecycle governance. That is where security teams should push for expiry, review, and revocation discipline instead of relying on one-time onboarding checks. NIST SP 800-63 Digital Identity Guidelines is relevant where the trust relationship depends on strong authentication, especially if partner access is established through federated or certificate-backed identity.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP API Security Top 10 addresses the attack and risk surface, while NIST SP 800-53 Rev 5 sets the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP API Security Top 10 | API2 — Broken Authentication | OCPI depends on authenticated partner-to-partner API calls. |
| API5 — Broken Function Level Authorization | OCPI partners should only invoke the functions their role requires. | |
| Recommendation — Enforce strong partner authentication and reject weak or reused credentials. Map each OCPI partner to explicit function-level access rules. | ||
| NIST SP 800-53 Rev 5 | IA-9 — Service Identification and Authentication | OCPI integrations rely on one service authenticating to another across organisations. |
| AC-3 — Access Enforcement | OCPI data exchange must be limited to approved partner scopes and objects. | |
| SC-12 — Cryptographic Key Establishment and Management | OCPI security depends on certificate and key lifecycle discipline. | |
| Recommendation — Use mutual service authentication for every OCPI partner connection. Enforce least-privilege access on OCPI endpoints and data objects. Rotate and retire OCPI trust keys on a defined lifecycle. | ||
Practitioner Guidance
What to prioritise: Start with partner onboarding, certificate lifecycle, and message authorization before you spend time on low-value packet inspection. If the trust relationship itself is weak, deeper traffic analysis will not compensate for a bad access model.
What to verify: Confirm that each partner can only reach the endpoints and data objects it genuinely needs, and that revocation actually works when a certificate, token, or integration key is rotated. A good OCPI control set should let you remove one partner without breaking the others.
Common mistake: Treating OCPI as a pure connectivity problem. In practice, it is an access-control and data-governance problem with operational consequences, so the review has to cover both security controls and business data exposure.
Practitioner takeaway: OCPI matters to security teams because it is a cross-organisational trust channel, and the safest deployments are the ones that keep partner access narrow, time-bound, and easy to revoke.