API Security Testing
Assessments of REST and GraphQL APIs focused on broken object-level authorization, mass assignment, rate-limit bypass, and authentication weaknesses across microservice boundaries.
What's included
Modern applications leak most of their attack surface through APIs, not the browser. This engagement tests your REST or GraphQL API directly — authenticated and unauthenticated — against the OWASP API Security Top 10, with particular focus on authorization logic, since that's where the highest-impact API vulnerabilities consistently live.
| Coverage area | Examples |
|---|---|
| Object-level authorization | IDOR / BOLA across endpoints and object IDs |
| Function-level authorization | Privilege escalation via admin/internal endpoints |
| Data exposure | Excessive data exposure, mass assignment |
| Rate limiting & resource abuse | Brute force, unrestricted resource consumption |
| Authentication | Broken auth, token handling, JWT misconfiguration |
| GraphQL-specific | Introspection exposure, query batching/depth abuse |
Deliverables
- API-specific scope covering endpoints, auth flows, and roles to be tested.
- A written report mapped to the OWASP API Security Top 10, with proof of concept and remediation guidance per finding.
- A prioritized fix list ranked by exploitability and business impact.
- One retest window after fixes ship.
Who this is for: teams shipping a public or partner-facing API, SaaS products with multi-tenant data, and mobile/backend teams that want authorization logic verified before launch.
Common questions
What is BOLA and why does it matter for APIs?
Broken Object-Level Authorization (BOLA), also called IDOR, happens when an API lets a user access or modify another user's data by changing an ID in the request. It is consistently ranked the top API security risk because it is common and often high-impact.
Do you test GraphQL APIs?
Yes. GraphQL testing includes introspection exposure, query depth and batching abuse, authorization checks per resolver, and injection through nested arguments.
Can this run alongside an active development sprint?
Yes. API engagements are typically scoped against a staging environment and a fixed API version, so testing can run in parallel with ongoing development without blocking releases.
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