API Security

API Penetration Testing

Deep security assessment of REST, GraphQL, gRPC, and WebSocket APIs. We test every endpoint, parameter, and workflow for authorization flaws, data exposure, and logic vulnerabilities.

OWASP API Security Top 10 (2023)

Complete coverage of the OWASP API Security Top 10 — the standard for API vulnerability assessment.

API1

Broken Object Level Authorization

IDOR vulnerabilities where attackers manipulate object IDs in API requests to access other users' data without proper authorization checks.

API2

Broken Authentication

Weak API authentication mechanisms, missing token validation, insecure API key management, and credential exposure in API traffic.

API3

Broken Object Property Level Auth

Mass assignment & excessive data exposure — APIs returning more data than needed or accepting property updates they shouldn't.

API4

Unrestricted Resource Consumption

Missing rate limiting, pagination abuse, large payload attacks, resource-intensive operations without throttling controls.

API5

Broken Function Level Auth

Accessing admin endpoints as regular user, HTTP method tampering (GET vs DELETE), and missing role-based endpoint restrictions.

API6

Unrestricted Access to Sensitive Flows

Automated abuse of business-critical flows: bulk purchasing, credential stuffing, spam registration, scraping without bot protection.

API7

Server Side Request Forgery

SSRF via URL parameters, webhook URLs, file imports, and any API parameter that triggers server-side HTTP requests.

API8

Security Misconfiguration

Missing CORS headers, verbose errors exposing stack traces, unnecessary HTTP methods, default configurations, and TLS issues.

API9

Improper Inventory Management

Shadow APIs, deprecated endpoints still accessible, undocumented API versions, and forgotten debug/staging endpoints in production.

API10

Unsafe Consumption of APIs

Trusting third-party API responses without validation, following redirects blindly, and processing unvalidated data from external services.

Common API Bugs We Discover

Real vulnerabilities we consistently find across REST, GraphQL, and WebSocket APIs.

GraphQL-Specific Attacks

  • Introspection query abuse for schema disclosure
  • Nested query depth attacks (DoS via deep queries)
  • Batch query abuse & alias-based brute force
  • Field suggestion enumeration & authorization bypass

REST API Vulnerabilities

  • HTTP verb tampering (PUT/PATCH/DELETE access)
  • Parameter pollution & JSON injection
  • JWT signature bypass & algorithm confusion
  • Race conditions in concurrent API requests

WebSocket Security

  • Cross-Site WebSocket Hijacking (CSWSH)
  • Missing origin validation on WebSocket handshake
  • Message injection & command smuggling
  • Session fixation in WebSocket connections

Data & Business Logic

  • Excessive data exposure in API responses
  • Insecure direct object references (IDOR)
  • API versioning bypass (v1 vs v2 auth gaps)
  • Pagination-based data extraction attacks

API Types We Test

REST APIs

JSON/XML endpoints, CRUD operations, pagination, filtering

GraphQL

Queries, mutations, subscriptions, schema analysis

gRPC

Protocol buffers, streaming, service reflection, auth

WebSocket

Real-time messaging, event-driven APIs, pub/sub

Secure Your APIs Before They Become Your Weakest Link

APIs are the backbone of modern applications — and the #1 attack vector. Let us find the gaps.