API Authentication & Authorization
Our API penetration testing evaluates authentication mechanisms, API keys, tokens, JWTs, OAuth flows, permissions, and authorization controls to identify unauthorized access risks.
// Expert API Penetration Testing
API Penetration Testing Services | Secure Web & Mobile APIs
Test Authentication, Authorization & API Business Logic
Pluto Security provides expert led API security testing and penetration testing for REST and GraphQL APIs. We assess authentication, authorization, business logic, endpoints, and data exposure using OWASP aligned practices, delivering clear findings and actionable remediation guidance.
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- Endpoints checked for abuse
Each API examined for the flaws attackers target most.
- Authentication put under pressure
We confirm only the right callers reach your data.
- Data exposure uncovered
Leaky responses and weak controls spotted early.
- Fixes tuned to your APIs
Guidance shaped around how your services actually work.
About API Pentest
Securing the APIs Behind Your Digital Ecosystem
APIs often connect critical applications, services, and sensitive data, making their security essential to the wider digital environment. Pluto Security combines manual API testing, OWASP API Security practices, and contextual analysis to assess authentication, authorization, business logic, and exposed endpoints across REST and GraphQL APIs. We provide evidence based findings with practical remediation guidance, helping security and development teams address meaningful risks with confidence.
Context Driven API Security Analysis
Manual REST & GraphQL Testing
Authentication & Authorization Assessment
Evidence Based Risk & Remediation Insights
// Scope
What We Cover in API Penetration Testing
API Authentication & Authorization
API Access Control & Object Security
We test object level, property level, and function level access controls to uncover IDOR, privilege escalation, and other authorization weaknesses during an API penetration test.
API Input Validation & Injection
Our penetration testing API approach examines parameters, payloads, headers, and inputs for injection vulnerabilities, validation flaws, request manipulation, and insecure data handling.
Business Logic & Sensitive Data Exposure
We assess API workflows, transactions, sensitive business functions, and responses for logic flaws, abuse opportunities, and unnecessary exposure of sensitive information.
API Configuration, Rate Limits & Inventory
Using appropriate API penetration testing tools, we assess security configurations, rate limiting, resource controls, exposed endpoints, undocumented APIs, and outdated API versions.
Mobile & Web API Security
Our mobile app API penetration testing and web API penetration testing assess the APIs supporting mobile applications, websites, SaaS platforms, and backend services for realistic attack paths and security weaknesses.
// Methodology
Our API Security Testing Methodology
- 01
Endpoint Mapping
We map your endpoints, methods, and the data each one exposes.
- 02
Authorization Testing
Testers probe for broken authorization, weak authentication, and excessive data exposure.
- 03
Manual Logic Review
Manual testing uncovers logic flaws that automated scanning tools often skip.
- 04
OWASP Alignment
Findings align with OWASP API Security guidance for consistency and trust.
- 05
Actionable Remediation
Every issue is proven and paired with actionable remediation for developers.
// Get started
API Testing Built for US Based Products
Manual testing for broken authorization, weak auth, and data exposure, aligned with OWASP guidance.
// What we deliver
What You Get From Our API Security Audit
Our API penetration testing delivers clear, developer-friendly reports with zero false positives. You receive an OWASP aligned vulnerability breakdown with verified PoCs, step by step remediation guidance for your dev team, and an executive summary with an Attestation Letter for clients and auditors.
- OWASP Aligned Security Report
Comprehensive vulnerability breakdown mapping every finding to the OWASP API Top 10 framework.
- Verified PoCs (Zero False Positives)
Step by step Proof of Concept exploits demonstrating validated BOLA, auth, and logic flaws.
- Developer Remediation Guidance
Prioritized, actionable patching instructions and code fixes ready for your sprint planning.
- Executive Attestation Letter
Signed certificate and high-level summary to present to enterprise clients, auditors, and investors.
Why Choose Pluto Security for API Pentest?
Secure the APIs Behind Your Digital Ecosystem
Our API penetration testing services combine manual security analysis, targeted testing, exploit validation, and risk-focused reporting. We assess APIs in the context of the applications, identities, business workflows, and backend systems they support. This helps uncover weaknesses that may not be visible through automated scanning alone and gives security and development teams clear priorities for remediation.
REST and GraphQL Testing
Our experts evaluate modern APIs for authentication, authorisation, input validation, business logic, and exposure risks.
Authorization Analysis
Testing identifies improper access controls that could allow users to access unauthorised resources or functionality.
Business Logic Testing
Specialists examine API workflows for manipulation opportunities that could bypass intended application security controls.
Endpoint Security Findings
Validated findings help developers secure vulnerable endpoints while reducing data exposure and unauthorised API activity.
Our Manual First Approach to API Security Audits
- We ingest Postman collections, OpenAPI/Swagger specs, or capture live traffic to map all public, private, and undocumented API endpoints.
- We dissect OAuth 2.0 flows, JWT tokens, and API key management to uncover token manipulation, session fixation, and weak grant types.
- We manually craft custom requests to expose Broken Object Level Authorization (BOLA), privilege escalation, and object state manipulation tools can't detect.
- We test for mass assignment, rate limiting bypasses, SSRF, broken function-level authorization, and data exposure across REST, GraphQL, and SOAP architectures.
What you get
- Comprehensive API Vulnerability Report
- Manually Verified PoC Exploits
- BOLA & Authorization Flaw Analysis
API Security Testing Tools & Frameworks
- Burp Suite
- Postman
- OWASP ZAP
- GraphQL Voyager and InQL
- Arjun
- Ffuf and Wfuzz
// Business impact
Why API Security Testing Matters
APIs connect applications, users, and sensitive data, making them a critical attack surface. API security testing helps identify weaknesses in authentication, authorization, data exposure, and business logic. Our API penetration testing services, including mobile app API penetration testing and web API penetration testing, help validate real world risks and strengthen security before attackers exploit them.
Protect Critical APIs
Secure application interfaces connecting sensitive systems, services, data, and customer functionality.
Prevent Unauthorised Data Access
Identify authorisation weaknesses that could expose information belonging to other users.
Secure Authentication Mechanisms
Test API keys, tokens, sessions, and authentication workflows for exploitable weaknesses.
Detect Business Logic Flaws
Identify API behaviours attackers could manipulate to bypass intended business controls.
Reduce Data Exposure
Find excessive information disclosure through improperly designed or secured API responses.
Strengthen API Resilience
Improve defences against injection, abuse, automation, and unauthorised API interactions.
Protect Digital Integrations
Reduce security risks across applications and third party systems relying on APIs.
Support Secure Development
Give development teams practical findings for building safer and more resilient APIs.
// API Security Testing FAQs
Your API Penetration Testing Questions, Answered
Still have questions about API penetration testing? Talk to an engineer.
// Get started
API Testing Built for US Based Products
Manual testing for broken authorization, weak auth, and data exposure, aligned with OWASP guidance.