ceronAPI security assessment
Test what an API caller can read, change, or trigger across customer and integration boundaries.
Does a valid credential grant more access than it should?
For teams exposing customer APIs, connecting SaaS integrations, adding webhooks, or changing how services authenticate and authorize requests.
- The boundary we assess
- The caller, credential, object, field, and operation behind each request.
- What to prepare
- API base URLs, an endpoint inventory or specification, test keys or accounts with different permissions, synthetic records, and approved request limits.
What the assessment can cover
These areas guide scoping. The agreed asset inventory, methods, and access determine which tests are included in your engagement.
Object and field authorization
Compare access to owned and unowned records. Check both what a caller can retrieve and which protected fields the caller can submit or change.
Credential lifecycle
Review key scope, expiration, rotation, and revocation using test credentials. A valid token still needs the correct tenant, audience, and action permissions.
Integrations and webhooks
Review agreed signing, delivery, replay, and retry behavior. Trace whether a repeated event can create an unintended duplicate business action.
Resource and workflow limits
Agree on bounded checks for expensive queries, exports, uploads, and sensitive operations. Availability testing requires explicit limits; unrestricted load testing is not assumed.
From a test to a useful finding
Ceron uses AI-assisted investigation and checks potential findings against evidence. Your report connects the affected asset, observed behavior, business impact, and recommended fix.
What the evidence should explain
- A read-only integration key submits a request to change a protected billing field on a synthetic record.
- The report separates the credential’s validity from its authority to perform the operation, and records the resulting record state rather than relying on the HTTP status alone.
- The remediation identifies where operation and field permissions should be enforced and the positive and negative cases needed to verify the change.
A specification cannot establish what every deployed endpoint enforces. Unlisted APIs, missing roles, third-party services, and unavailable environments are recorded as coverage limitations.
This example explains the method; it is not a customer result. Read about the Ceron Agent Harness.
Plan the review with your team
Use these guides to turn a broad concern into testable questions before your scoping call.
Plan API authorization tests with the tenant matrix →Before you book
Can testing include authenticated APIs?
Yes, when the API and access are authorized in the engagement. Provide test credentials for the relevant roles and tenants so permitted and denied behavior can be compared.
Will you test a third-party integration?
The scope must distinguish your integration from the provider’s systems. Testing requires the relevant permission; access to an integration does not authorize unrestricted testing of the provider.
How does this differ from the web application audit?
The API assessment focuses on callers, credentials, endpoints, and operations. A web application audit also considers browser sessions and user workflows. Shared boundaries can be covered in one agreed engagement.
Start with the boundary that matters.
Bring the systems you want reviewed and the decision you need to make. We agree on assets, access, testing methods, timing, and a fixed fee before work begins.
One-time audits from $1,500. Payment applies only if a verified, actionable vulnerability is found within scope. See pricing and terms.