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API Penetration Testing by Penti
Penti uncovers exploitable weaknesses that often lurk in applications by employing rapid, AI-powered pentesting with human security validation.
Penti’s platform provides ongoing API application penetration testing, which pinpoints real-world attack paths, logic flaws, and authorization failures that can put your organization’s sensitive data and business operations at risk.
API Penetration Testing Overview
APIs are now the largest and fastest-growing attack surface for modern applications. Penti’s platform delivers a comprehensive API pentest experience that combines agentic security testing with expert validation, accelerating the time typically spent on pentesting.
With our API penetration testing tool, Penti continuously evaluates API endpoints across environments, detecting security issues that traditional point-in-time assessments miss. Penti’s platform supports modern development workflows and integrates directly into CI/CD pipelines, enabling continuous testing throughout the API lifecycle.
Penti’s API pentesting tool uses agentic tools to surface common and advanced weaknesses, while certified penetration testers validate findings, uncover business logic flaws, and reduce false positives.
What Penti Helps You Achieve
APIs evolve quickly, and so do security threats. Penti ensures that your company’s targeted security testing aligns with business priorities.
Reduce API-Driven Breach Risk
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Protect Customer Trust and Revenue
Enable Secure Development at Scale
API Discovery and Inventory
AI-Driven Testing and Analysis
Manual Validation by Experts
Authorization and Data Access Testing
Reporting and Response Validation
Remediation and Continuous Testing
How Penti Works
Penti delivers a structured, repeatable API penetration testing process designed for modern engineering environments.
Sample API Penetration Testing Report
Every API security engagement ends with a report your dev team can act on the same day. Penti documents every API vulnerability found — from broken authorization and injection attacks to rate limiting failures — with the exact exploitation steps, compliance mapping, and a specific fix for each.
Executive Summary
Opens with report composition context — a compilation of findings from actual Penti engagements covering OWASP API Security Top 10, REST and GraphQL endpoint testing, injection through API parameters, authentication and authorization bypass on API surfaces, and multi-year engagements with remediation validation. A Key Findings Summary states total Critical, High, Medium counts and the number of security controls validated. The Most Significant Findings section lists the top vulnerabilities with one-sentence impact descriptions. Followed by an Impact Assessment and a Recommendations Priority timeline.
Scope & Our Tools
Scope section covers all API categories tested: RESTful APIs, GraphQL endpoints, SOAP web services, and microservices — including endpoint discovery, parameter mining, schema introspection, and injection testing across all API surfaces. Frameworks applied: OWASP API Security Top 10, OWASP ASVS, NIST SP 800-95. API-specific tools listed: Postman (testing and automation), GraphQL Voyager (schema introspection), Arjun (HTTP parameter discovery), ParamSpider (parameter mining), and custom API fuzzing scripts — alongside Burp Suite Professional, ZAP, and injection testing tools.
Manual Assessment Results
A summary table listing every confirmed finding with title, status (Active or Remediated), and risk level. Each finding card documents which API surface was affected, the exact steps used to confirm exploitation, risk level, OWASP API Security Top 10 category, compliance control violated, and remediation guidance with code examples specific to the API layer.
Prioritized Remediation
A three-tier action plan with API-layer fixes: Tier 1 (24–48 hours) covers the most critical findings on API authentication and input handling; Tier 2 (1–2 weeks) covers access control and server-side validation gaps on API endpoints; Tier 3 (1–3 months) covers OWASP API Security Top 10 remediation program, SAST integration, and API security code review. Each item includes business impact, technical effort, and specific recommended actions.
Re-testing
For API findings, retests re-run the original exploit against the patched API — re-sending the injection payload, repeating the brute force attempt, replaying the request that triggered the vulnerability — to confirm the fix holds under identical attack conditions. The section shows completed retests with original risk level, retest date, and verified status. Retest timeline: Tier 1 within 1 week, Tier 2 within 2 weeks.
Penetration testing types done by Penti
Cloud pentesting
Mobile pentesting
Network pentesting
External network pentesting
Internal network pentesting
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Web app pentesting
Penetration testing for IoT
Compliance-driven pentests by Penti
Industries we work with
The Value of Penti’s API Penetration Testing Tool
Penti delivers measurable security outcomes and client-friendly security evidence instead of endless security reports.
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Accurate Results You Can Trust
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Continuous Visibility Across APIs
Built for Modern Engineering Teams
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One Platform, Total Coverage
Trusted by Security and Engineering Leaders
From CISOs and AppSec leaders to DevOps and platform teams, organizations rely on Penti to secure APIs that power critical business operations.
Penti's service is a game changer for our compliance needs. The insights we gained were invaluable for our team. Doing this well is crucial for our compliance targets and key in advancing our strategic initiatives.
The integration between Penti, our system, and third parties like Vanta is exceptional. I would also like to mention that their response times are extremely fast!
Penti has been like having an experienced and nimble Security Engineer on staff. They have outlined issues in our platform and guided us towards implementations and fixes that allow for us to ensure we are treating our users data with the utmost care.
What Sets Penti Apart
API threats like injection, machine-in-the-middle (MITM), and DDoS attacks have evolved rapidly, to the point that traditional pentesting struggles to keep up. Penti launches in minutes, so that you can ensure your API security is functioning as intended.
Built for Modern APIs
Penti’s agents simulate real-world attacks, tailored to test modern API architectures and look for signs of malicious attacks.
Findings Evaluated by Human Cyber Experts
Every critical issue is reviewed by experienced penetration testers and ethical hackers for accuracy and context.
Continuous, Not Point-in-Time
Unlike traditional penetration testing, Penti provides runtime protection insights through continuous testing, accessible through a streamlined, user-friendly dashboard.
Actionable Remediation Steps
Penti not only reports findings, but prioritizes them by risk-level and business impact so that your team can take steps to resolve issues immediately.
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FAQ
What is API penetration testing?
API penetration testing evaluates APIs for exploitable weaknesses by simulating real-world attacks to identify security vulnerabilities.
How is Penti different from traditional API testing?
Penti combines agentic AI penetration testing with expert validation, delivering continuous security insights instead of one-time assessments.
Does Penti support modern API architectures?
Yes. Penti supports REST and SOAP APIs, API specifications, and complex authentication flows.
Can Penti identify business logic flaws?
Yes. Manual testing focuses on business logic, authorization bypasses, and misuse scenarios automated tools can overlook.
How does Penti help with compliance?
Penti supports compliance efforts by providing evidence of ongoing, rigorous security testing and identifying vulnerabilities aligned with OWASP API risks.
Will Penti find undocumented APIs?
Yes. API discovery identifies undocumented and legacy endpoints that increase exposure.
How often are APIs tested?
Testing is continuous, allowing teams to catch new vulnerabilities as APIs change.
Is Penti suitable for fast-moving development teams?
Absolutely. Penti integrates into CI/CD workflows and supports rapid development without adding friction.
