API Security

API Security Testing

Penetration testing for REST and GraphQL APIs — finding the authorization failures and data exposure risks your development team doesn't know to look for

API vulnerabilities are behind some of the largest breaches in recent years. We test whether your authorization logic, object ownership controls, and tenant boundaries hold up against an attacker who deliberately misuses valid credentials.

Engagement Duration

4-8 business days

Primary Outcome

A complete risk picture of your API surface — each exploitable path documented with proof of impact, affected data objects, and specific remediation steps.

How This Engagement Works

Scope and Threat Modeling

Human-led

We define your attack surface, trust boundaries, and the most likely attacker goals before testing begins.

AI-Assisted Discovery

AI-assisted

Automation expands coverage and surfaces anomalous patterns worth manual attention — no finding ships without human review.

Manual Exploit Validation

Human-led

Every finding is manually reproduced and confirmed by a senior analyst before it appears in your report.

Remediation and Free Retest

Collaborative

We provide developer-ready fix guidance and retest at no additional cost after your patch window closes.

What We Commonly Uncover

01

BOLA/IDOR vulnerabilities that let authenticated users access other users' data

02

GraphQL introspection and query abuse exposing fields outside their intended audience

03

Rate-limiting gaps that enable credential stuffing, enumeration, and abuse at scale

04

Verbose error responses that hand attackers a roadmap to your data model

Authorization Reality Check

We test your API the way an attacker would — with valid credentials, systematically probing whether object ownership, role boundaries, and tenant isolation actually hold under adversarial use.

BOLA and function-level authorization abuse scenarios

Cross-tenant data access and boundary erosion checks

Token scope enforcement under replay and mutation

Ownership validation gaps in nested object relationships

Abuse Path and Data Exposure Testing

We combine automated endpoint analysis with manual abuse scenario testing to find what's both technically exploitable and practically harmful to your business.

Mass assignment and structural parameter tampering

Rate-limit resistance under distributed request patterns

Verbose response leakage and metadata overexposure

GraphQL introspection, depth, and resolver abuse testing

Coverage Areas

Area 01

REST contracts

Area 02

GraphQL schema and resolvers

Area 03

Authentication and authorization

Area 04

Request abuse controls

Area 05

Input and schema validation

Area 06

Data minimization

Area 07

Token lifecycle and revocation

Area 08

Error/metadata handling

Reporting and Retest

Endpoint Risk Matrix

Severity and exploitability scored per endpoint, operation, and data object — so your team knows where to start.

Validated Abuse Cases

Reproducible proof for every authorization failure and data exposure finding.

Implementation Fix Guidance

Concrete recommendations for middleware, schema, and handler-level hardening — not generic API security advice.

Free Retest Validation

After you fix, we retest to confirm API vulnerabilities are fully resolved.