Offensive Security & VAPT
API Security Testing
APIs are today's primary attack surface. We test REST, GraphQL and microservice APIs for broken authorization, excessive data exposure, injection and rate-limit abuse - mapped to the OWASP API Security Top 10.
Typical timeline
8–12 business days
Engagement model
Grey / black / white box
How it runs
Kickoff → test → report → re-test
Overview
APIs form the backbone of modern web, mobile, and cloud-native architectures, representing the single largest target for data exfiltration. Traditional firewalls and web scanners are ineffective at detecting logical flaws, authorization bypasses, and data exposure within API endpoints.
Our API security testing targets the OWASP API Security Top 10. We ingest your OpenAPI, Swagger, or GraphQL schemas to map out the entire endpoint surface, manually testing for broken object-level authorization (BOLA), mass assignment, rate-limiting gaps, and complex injection vectors, ensuring your integration layer is robust.
At a glance
- Broken object/function-level authorization (BOLA/BFLA)
- Excessive data exposure & mass assignment
- Injection, SSRF and rate-limit abuse
- Auth flow and token handling review
Coverage
What we cover
BOLA & BFLA
Probing for Broken Object Level and Broken Function Level Authorization to access unauthorized resources.
Mass Assignment
Attempting to update restricted object properties (e.g., isAdmin) via input payload tampering.
GraphQL Specifics
Testing for query depth/complexity attacks, batching abuse, and schema introspection exposure.
Rate Limiting & DoS
Attempting API exhaustion, resource-intensive queries, and scanning for missing request thresholds.
Authentication & JWT
Probing token signature validation, algorithm switching, expiration checks, and session tokens.
SSRF & Data Injection
Probing parameters for Server-Side Request Forgery and malicious database query injections.
Outcomes
What you get
Methodology
How the engagement runs
Spec review
We ingest your OpenAPI/GraphQL schema and map the surface.
Auth testing
Authentication, authorization and token handling probing.
Abuse testing
Injection, data exposure, SSRF and rate-limit attacks.
Report
Findings with PoCs and remediation, plus re-test.
Deliverables
What lands in your inbox
- OWASP API Top 10 mapped report
- PoC evidence and exploit chains
- Remediation and re-test
Why A5
Why teams pick us
Manual-first, not scan-first
Senior testers hand-craft test cases for your business logic - scanners only set the baseline.
Proof, not guesses
Every finding ships with a working proof-of-concept and exact reproduction steps.
Fix-focused reporting
Remediation with code and config examples, not just a CVSS number and a shrug.
Re-test included
We verify your fixes and issue a clean report - closure, not just discovery.
FAQ
Frequently asked
Do you test GraphQL specifically?
Yes - introspection abuse, query depth/complexity, batching attacks and authorization at the resolver level.
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CIS-aligned cloud posture review across IAM, network, storage and workloads for AWS/Azure/GCP.
Need api security testing?
Prove both before launch.
Bring us your app, audit deadline, or security concern. We'll map the fastest path to WCAG conformance, VAPT coverage, and regulator-ready evidence.
