API Penetration Testing

Uncover BOLA/IDOR, broken object level authorization, rate limiting bypasses, JWT flaws, and shadow endpoints across REST, GraphQL, gRPC, and SOAP APIs.

REST, GraphQL & gRPC

Postman, Swagger & OpenAPI Native

OWASP API Top 10

Deep BOLA & BFLA Authorization Testing

Zero Downtime

Safe Staging & Rate Limit Audits

CORE ADVANTAGES

Why Engineering Teams Trust Vaeto for API Pentesting

Automated API scanners miss 80%+ of authorization matrix flaws. Our OSCP security engineers manually verify every endpoint object boundary.

BOLA / IDOR Deep Inspection

Manually testing cross-tenant boundaries to ensure users cannot manipulate integer/UUID object keys to steal other tenant data.

GraphQL & gRPC Schema Audits

Probing nested query recursion DoS, introspective field leaks, unhandled mutations, and gRPC protobuf authorization flaws.

JWT & OAuth 2.0 Verification

Testing algorithm confusion attacks (none algorithm, HMAC key injection), OAuth state CSRF, and token revocation gaps.

30-Day Re-Testing SLA

Deploy API code fixes with confidence. We re-test all remediated vulnerabilities at zero extra charge within 30 days.

OWASP API TOP 10 SCOPE

OWASP API Security Top 10 Matrix

Comprehensive evaluation covering all 10 OWASP API 2023 risk categories in order.

API1:2023CRITICAL

Broken Object Level Authorization (BOLA)

Direct access to object IDs in API endpoints allowing unauthorized cross-tenant data access.

API2:2023CRITICAL

Broken Authentication & Token Tampering

JWT signature bypasses, predictable API keys, weak OAuth 2.0 flows, and missing rate limits.

API3:2023HIGH

Broken Object Property Level Authorization

Mass assignment and excessive data exposure flaws leaking sensitive user fields in JSON responses.

API4:2023HIGH

Unrestricted Resource Consumption & DoS

Lack of API rate limiting, execution timeouts, or memory limits causing service degradation.

API5:2023CRITICAL

Broken Function Level Authorization (BFLA)

Administrative API endpoints accessible to regular user roles due to flawed access controls.

API6:2023HIGH

Unrestricted Access to Business Flows

Automation bots abusing API logic for bulk operations, ticket hoarding, or spam creation.

API7:2023HIGH

Server-Side Request Forgery (SSRF) in APIs

API webhooks or URL parameters forcing backend nodes to query internal cloud metadata services.

API8:2023MEDIUM

Security Misconfiguration & CORS Leaks

Overly permissive CORS headers (`*`), exposed debug endpoints, and verbose stack traces.

API9:2023HIGH

Improper Inventory Management & Shadow APIs

Exposed v1/legacy API endpoints lacking security patches or modern authentication controls.

API10:2023MEDIUM

Unsafe Consumption of Third-Party APIs

Trusting unvalidated third-party API payloads leading to injection or data corruption.

API METHODOLOGY

Our 6-Step API Pentest Process

Standardized execution aligning with PTES & OWASP API Security Project.

STEP 01

Scoping & OpenAPI / Postman Import

STEP 02

Endpoint Recon & Shadow API Mapping

STEP 03

Authentication & JWT Manipulation

STEP 04

BOLA, BFLA & Logic Exploitation

STEP 05

CVSS 4.0 Reporting & Fix Guidelines

STEP 06

30-Day Re-Testing & API Certificate

FREQUENTLY ASKED QUESTIONS

API Pentesting FAQ

Do you test REST, GraphQL, gRPC, and SOAP APIs?

Yes! Our security engineers test all API architectures including RESTful HTTP services, GraphQL schemas & mutations, gRPC microservices (protobuf), and legacy SOAP XML endpoints.

How do you test for BOLA (Broken Object Level Authorization)?

Can API pentesting cause performance issues or downtime on production?

What materials do we need to provide before starting an API pentest?

Does API Penetration Testing satisfy SOC 2 and ISO 27001 mandates?

What deliverables will our development team receive?