AI Pentest for APIs: Automated REST & GraphQL Security Testing

APIs Are the #1 Attack Surface

91% of web attacks target API endpoints, and AI-generated backends often skip authorization checks entirely. A single missing auth check can expose your entire database to unauthenticated access.

API Pentest Checklist

Follow these 10 steps to thoroughly pentest your API. Critical items represent the most commonly exploited API attack vectors.

Discover all API endpoints

Crawl documentation, OpenAPI specs, and network traffic to build a complete map of every API endpoint.

Test authentication mechanisms

Probe JWT handling, OAuth flows, API key validation, and session management for bypass vulnerabilities.

Verify authorization per endpoint

Ensure every endpoint enforces proper access control and users cannot access other users’ resources.

Test rate limiting

Verify that rate limits are enforced on authentication, password reset, and resource-intensive endpoints.

Probe input validation

Send malformed, oversized, and unexpected data types to every parameter to find injection and parsing bugs.

Check for mass assignment

Test whether API endpoints accept extra fields that can escalate privileges or modify protected attributes.

Test BOLA/IDOR vulnerabilities

Systematically swap object IDs across endpoints to find broken object-level authorization flaws.

Analyze error responses

Check that error messages do not leak stack traces, database schemas, or internal system information.

Test GraphQL introspection

Check if introspection is enabled in production and probe for query depth, complexity, and batching attacks.

Verify API versioning security

Test deprecated API versions for vulnerabilities and ensure old endpoints are properly decommissioned.

Benefits of AI Pentest for APIs

Discovers Hidden Endpoints Automatically

AI agents crawl your application to find undocumented endpoints, admin routes, and debug interfaces that manual testing misses.

Tests Every Parameter Combination

Exhaustively tests parameter combinations, edge cases, and boundary conditions that would take human testers weeks.

Catches BOLA/IDOR That Scanners Miss

AI understands application context to test object-level authorization, the #1 API vulnerability that traditional scanners cannot detect.

Supports REST, GraphQL, and WebSocket

Works with any API architecture including REST, GraphQL, gRPC, and WebSocket endpoints out of the box.

The OWASP API Security Top 10

How AI pentest agents handle each category in the OWASP API Security Top 10.

API1 - Broken Object Level Authorization (BOLA)

AI swaps user IDs across every endpoint. GET /api/users/123 becomes GET /api/users/456. This is the #1 API vulnerability and the one traditional scanners miss most often.

API2 - Broken Authentication

AI probes JWT token handling, tests for token reuse, checks expiration enforcement, and attempts authentication bypass through parameter manipulation.

API3 - Broken Object Property Level Authorization

AI sends extra fields in POST/PUT requests to test mass assignment. Can a regular user set admin: true in their profile update?

API4 - Unrestricted Resource Consumption

AI tests rate limits by sending rapid requests to authentication, search, and data export endpoints.

API5 - Broken Function Level Authorization

AI tests admin endpoints with non-admin tokens. Can a regular user access /api/admin/users?

API6 - Unrestricted Access to Sensitive Business Flows

AI tests business-critical flows like checkout, account creation, and password reset for abuse patterns.

API7 - Server Side Request Forgery (SSRF)

AI tests URL parameters for SSRF, attempting to access internal services and cloud metadata endpoints (169.254.169.254).

API8 - Security Misconfiguration

AI checks for debug mode, verbose errors, CORS wildcard, missing rate limits, and default credentials.

API9 - Improper Inventory Management

AI discovers undocumented endpoints, old API versions, and debug routes that developers forgot to remove.

API10 - Unsafe Consumption of APIs

AI tests how your API handles responses from third-party services, checking for injection through upstream data.

Real API Vulnerabilities AI Agents Find

Anonymized examples from real AI pentest engagements.

BOLA in Organization Endpoint

A Supabase-powered SaaS had a /api/organizations/:id endpoint that returned full organization data including billing details and member emails. The endpoint checked if the requesting user was authenticated but not if they belonged to the organization. AI found this BOLA vulnerability in 30 seconds.

Command Injection in Export Route

A Next.js API route at /api/admin/export accepted a format parameter that was passed directly to a shell command. AI detected command injection by sending format=csv;whoami and receiving the server’s username in the response.

GraphQL Introspection Leak

A GraphQL API had introspection enabled in production, exposing the entire schema including internal mutation types. AI used the schema to discover an undocumented deleteUser mutation that had no authorization check.

API Pentest by Architecture

REST APIs

Test CRUD operations on every resource with different auth tokens. Check for BOLA on GET/PUT/DELETE. Verify pagination doesn’t leak data beyond authorized scope.

GraphQL APIs

Test query depth limits, introspection access, mutation authorization, and nested resolver permissions. Check for batch query attacks and query complexity bombs.

WebSocket APIs

Test connection authentication, message authorization, and injection through WebSocket messages. Verify that subscriptions respect access control boundaries.

AI Pentest for Web Applications

Automated security testing for SPAs and AI-built apps

AI Pentest for Cloud Infrastructure

AWS, GCP & Azure security testing

AI Penetration Testing Guide

Complete guide to AI-powered penetration testing

Pentest Your APIs Today

VibeEval’s AI pentest agents discover and test every API endpoint automatically. Find BOLA, injection, and authorization flaws before attackers do.