Offensive security · VAPT

    API Security Testing

    Comprehensive security testing for REST, GraphQL, and SOAP APIs.

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    Typical duration
    5–10 working days
    Checks performed
    20+
    Areas covered
    4
    Standards
    OWASP API Security Top 10 · OWASP ASVS
    Overview

    About API Security

    APIs power your apps and partners — and they expose your data directly. We test REST, GraphQL, SOAP and WebSocket APIs for broken authorization, excessive data exposure and business-flow abuse, mapped to the OWASP API Security Top 10.

    What we focus on

    • 01Authentication Testing
    • 02Authorization Testing
    • 03Rate Limiting
    • 04Input Validation
    Testing checklist

    20 checks we follow. Fully documented.

    Every item below is tested and recorded in your report — pass or fail — so you know exactly what was covered.

    OWASP API Security Top 10OWASP ASVSCVSS v3.1

    Authentication

    5
    • OAuth 2.0 & OpenID Connect flows
    • JWT signature & algorithm checks
    • API key exposure
    • Token expiry & revocation
    • Credential stuffing protection

    Authorization

    5
    • Broken object-level authorization (BOLA)
    • Broken function-level authorization
    • Mass assignment
    • Tenant isolation
    • Object property-level authorization

    Data & input

    5
    • Excessive data exposure
    • Injection in parameters & bodies
    • GraphQL introspection & query depth
    • Schema validation
    • Server-side request forgery

    Resilience

    5
    • Rate limiting & throttling
    • Resource exhaustion
    • Business flow abuse
    • Improper inventory (shadow & old API versions)
    • Unsafe consumption of third-party APIs
    Methodology

    How the engagement runs

    Typical duration: 5–10 working days.

    1. 01Scoping & API documentation review
    2. 02Endpoint discovery & inventory
    3. 03Authentication & token analysis
    4. 04Authorization testing per role & object
    5. 05Business-flow & abuse testing
    6. 06Reporting & free retest

    Standard toolkit

    Licensed, industry-standard tools — every result is validated by hand, not just scanned.

    • BUBurp Suite ProIntercepting proxy for manual web & API testing
    • POPostmanAPI collection testing
    • AUAutorizeAutomated authorization checks between roles
    • FFffufContent and parameter discovery
    • GRGraphQL VoyagerVisualizing GraphQL schemas

    Coverage model

    88%

    hands-on manual testing

    Scanners find the noise. Our testers find the flaws that chain into compromise.

    What we cover

    OWASP Top 10 coverage

    Every category below is tested and reported — pass or fail.

    OWASP API Security Top 10:2023

    1. API1Broken Object Level Authorization Tested
    2. API2Broken Authentication Tested
    3. API3Broken Object Property Level Authorization Tested
    4. API4Unrestricted Resource Consumption Tested
    5. API5Broken Function Level Authorization Tested
    6. API6Unrestricted Access to Sensitive Business Flows Tested
    7. API7Server Side Request Forgery Tested
    8. API8Security Misconfiguration Tested
    9. API9Improper Inventory Management Tested
    10. API10Unsafe Consumption of APIs Tested
    See how we test this

    Common findings

    Issues we regularly uncover in API Security engagements.

    • Broken object-level authorization (BOLA)
    • Mass assignment of privileged fields
    • Excessive data in API responses
    • Missing rate limiting
    • JWT signature or algorithm weaknesses
    • Old API versions still reachable

    What we need from you

    Share these during scoping and we can start quickly.

    • Base URLs and environments
    • Swagger/OpenAPI spec or Postman collection
    • Tokens or test users for each role
    • Sample request flows for key journeys
    • Rate-limit and WAF details
    Industries we serve

    Built for regulated, fast-moving teams.

    • Fintech & BFSI

      Payments, lending and customer financial data

    • Healthcare

      Patient records and care applications

    • SaaS & IT

      Multi-tenant platforms and APIs

    • E-commerce & retail

      Checkout, payments and customer accounts

    • EdTech

      Student data and learning platforms

    • Manufacturing

      Plant networks and business systems

    • Logistics

      Tracking apps, partner APIs and fleets

    • Startups

      Security ready for investors and enterprise deals

    Deliverables

    What you receive

    View a sample report

    Executive summary

    Plain-language business-risk narrative and an overall posture rating for leadership and the board.

    Technical report

    Every finding with a CVSS 3.1 score, CWE mapping, evidence and step-by-step reproduction.

    Remediation roadmap

    Prioritized, effort-estimated fix plan mapped to owners, timelines and quick wins first.

    PoC evidence pack

    Annotated requests, screenshots and scripts for each issue — enough to reproduce and fix fast.

    Free retest

    We re-verify every critical and high fix and update each finding’s status — included, no extra charge.

    Attestation letter

    A signed letter confirming testing was performed — shareable with customers, auditors and partners.

    Outcomes

    What you get

    • Protect API endpoints

    • Prevent data leaks

    • Ensure API compliance

    • Stop abuse with proper authorization and rate limits

    FAQ

    Common questions

    Can't find what you're looking for? Our team is one call away.

    We test REST, GraphQL, SOAP, and WebSocket APIs across all platforms.

    Explore more

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    Next step

    Start your API Security engagement.

    Get a scoped proposal from our security team — no obligation.

    Request a proposal +91 8790899473