API Penetration Testing Services

Kroll’s certified pen testers find vulnerabilities in your APIs that scanners simply can’t identify. Protect your business and keep sensitive data secure by leveraging our knowledge and experience in testing modern API infrastructures.

Talk to an Expert
/en/services/cyber-risk/assessments-testing/penetration-testing/api-penetration-testing service

API Penetration Testing: Why Should You Care?

APIs are ubiquitous across modern application environments, making them an enticing target for bad actors looking to compromise other systems or pivot within your networks. A focused API penetration testing program looks for vulnerabilities in how your APIs are designed, implemented and configured to prevent attackers from using APIs as an access point to get a foothold in your organization.


How Much Risk Can APIs Expose You To?

APIs regularly handle a large volume of sensitive data, such as payment card industry (PCI) and personal identifiable information (PII) and are also an access point further into your environment. Untested APIs can leave the door wide open for unauthorized access and data exfiltration — data scraping is one example of how attackers can gain access, unnoticed, to sensitive data. It is essential for APIs to be tested regularly to catch these issues before your business is exposed.


Common Vulnerabilities API Pen Testing Can Detect

  • Insufficient Security Configuration
  • Authentication and Authorization Challenges
  • HTTP Header Injection
  • Input Validation Errors
  • Insufficient Logging

Pulling Back the Curtain: API Pen Testing Tools and Expert Insight

Kroll regularly works with large enterprise organizations in highly regulated industries to structure, manage and execute API penetration testing programs. 

We have developed a granular approach that goes beyond what scanners and testing tools can uncover on their own. We provide both coverage and depth, looking at not just what is happening on the front end, but using expert inference to deduce what is going on in the back end as well.

As added value, our program managers and technical leads keep your project on track and focused on the areas of most risk and of most importance to your overall business.

What Our Team Brings to the Table


100,000+ Hours of Security Testing and Assessment Work Every Year

Kroll’s world-class penetration testing services are built on thousands of hours of cyber security assessments, extensive front-line intelligence and a team of certified cyber experts — the foundation for our sophisticated and scalable approach.


100+ Security Certifications across Cyber Risk, Privacy, Offensive Security, Cloud and Hybrid Systems

Our team brings the depth and breadth of expertise needed to tackle complex cyber risk challenges across your environments, whatever your industry.


3,000+ Incident Response Cases Handled Worldwide Every Year

Kroll's DNA as incident response leader expands our assessments beyond compliance mandates to provide actionable remediation based on frontline threat intelligence.


Our 6-Phase API Pen Testing Process

Web Application Penetration Testing Services


Looking for Other Penetration Testing Services?


  • Network Penetration Testing
  • IoT and Hardware Device Penetration Testing
  • Container Security

We’re Certified to the Highest Global Industry Standards

Start Testing Your APIs Today

Get in touch with our team to learn how we can help you build an API pen testing program specific to your organization’s needs.

Related Team

Connect with us

Krishna Raja
Krishna Raja
Managing Director
Cyber Risk
Sachin Kumar
Sachin Kumar
Associate Managing Director
Cyber Risk
New Delhi

Explore areas we can helpExplore areas we can help

Cyber Risk

Incident response, digital forensics, breach notification, managed detection services, penetration testing, cyber assessments and advisory.

Penetration Testing Services

Validate your cyber defenses against real-world threats. Kroll’s world-class penetration testing services bring together front-line threat intelligence, thousands of hours of cyber security assessments completed each year and a team of certified cyber experts — the foundation for our sophisticated and scalable approach.

Web Application Penetration Testing Services

Assess the design, configuration and implementation of your web apps for critical vulnerabilities. Kroll’s scalable pen testing services consider the business case and logic of your apps, providing more coverage and an optimized program based on risk.

Agile Penetration Testing Program

Integrated into your software development lifecycle (SDLC), Kroll’s agile penetration testing program is designed to help teams address security risks in real time and on budget.

Cloud Penetration Testing Services

Kroll’s team of certified cloud pen testers uncover vulnerabilities in your cloud environment and apps before they can be compromised by threat actors.

Application Security Services

Kroll’s product security experts upscale your AppSec program with strategic application security services catered to your team’s culture and needs, merging engineering and security into a nimble unit.

Red Team Security Services

Red team security services from Kroll go beyond traditional penetration testing, leveraging our frontline threat intelligence and the adversarial mindset used by threat actors to push the limits of your information security controls.

Application Threat Modeling Services

Kroll helps development teams design and build internal application threat modeling programs to identify and manage their most pressing vulnerabilities.

Incident Response Retainer

Kroll delivers more than a typical incident response retainer—secure a true cyber risk retainer with elite digital forensics and incident response capabilities and maximum flexibility for proactive and notification services.

Proactive Services Case Studies

Penetration Testing

Continuous Penetration Testing Optimizes Security in Agile Product Development for Software Startup

Penetration Testing

Scaling Up Application Security for a Global Telecommunications Company

Penetration Testing

Penetration Testing and Attack Simulation for VotingWorks’ Risk-Limiting Audit Software Arlo

Penetration Testing

AWS Penetration Testing Gives In-Depth Cyber Risk Insight to Specialist Bank

Penetration Testing

State of Arkansas Cyber Security Assessment

by Greg MichaelsKeith L NovakJeff Macko

Penetration Testing

Red Team Exercise Helps International Trade Organization Comply with FCA Cyber Security Mandates


CVE-2021-43702 from Discovery to Patch: ASUS Modem/Router Device Takeover Vulnerability

Jun 21, 2022

by Luke Walker


Webcast Replay – Q1 2022 – Threat Landscape Virtual Briefing: Threat Actors Target Email for Access and Extortion

May 18, 2022


MFA Prompt Bombing No More: Countering MFA Bypass Tactics

May 23, 2022

by Devon AckermanPierson ClairDavid Wagner Joshua Karanouh-Schuler


Q4 2021 Threat Landscape: Software Exploits Abound

Feb 16, 2022

by Keith WojcieszekLaurie Iacono George Glass