Nederlands
Web Application Penetration Testing by Ethical Hackers with Deep Development Expertise
Web applications are among the most common targets for cyberattacks. They are often publicly accessible and contain sensitive data, making them attractive entry points for hackers. Security starts at the code level, a principle deeply embedded in our approach.
As specialists in both secure software development and ethical hacking, we understand exactly how applications are built—and how attackers attempt to exploit them. This enables us not only to uncover vulnerabilities but also to provide realistic and actionable recommendations to development teams.
More Than Just Identifying Vulnerabilities
Our expertise in building privacy-sensitive systems allows us to go beyond simply identifying vulnerabilities. We assess not only security risks but also broader development practices. For example, we evaluate whether unit tests are implemented and whether security mechanisms within a development framework are effectively utilized.
Additionally, we provide observations on functionality that may not be working as intended, even if it is not directly classified as a vulnerability. This helps developers implement early improvements and prevents minor issues from becoming serious security risks in the future.
Our Approach – How We Test Your Web Application
We use a structured and in-depth approach to uncover vulnerabilities and help you effectively mitigate them.
Intake & Scoping
We analyze your application and architecture, identify critical functionalities, and map out specific threats. The scope of the pentest is determined based on your objectives, requirements, technologies, and risk profile.
Performing the Pentest
Our ethical hackers use a combination of manual and automated testing methods to uncover vulnerabilities. We simulate real-world attack scenarios and evaluate your application against the OWASP Application Security Verification Standard (ASVS) and NCSC guidelines. This includes testing authentication, authorization, input validation, and API security.
Analysis & Risk Assessment
Vulnerabilities are analyzed and prioritized based on impact and exploitability. We follow recognized methodologies such as OWASP and CVSS to provide an objective risk assessment and recommend the most effective mitigation strategies.
Reporting & Recommendations
We provide a comprehensive report, including an executive summary, technical details, and clear recommendations for developers and security teams. Our advice is immediately actionable and focused on structurally improving security.
Retesting & Validation
Once vulnerabilities have been addressed, we optionally conduct a retest to verify whether security has genuinely improved and risks have been effectively mitigated.
Post-Test Support & Guidance
In addition to test results, we provide guidance on secure development and preventive measures. We help your team implement security best practices and structurally enhance the resilience of your application.
Different Types of Pentests
Web Security Scan offers different types of penetration tests depending on the client's objectives and requirements. The primary distinction between these tests lies in the level of knowledge, available test data, and background information provided to the tester beforehand.
The specific type of pentest is determined in consultation with the client, based on their needs, environment, and the results of the intake process.
- Black Box Pentest - The tester has minimal prior knowledge, providing the best simulation of a real-life attack.
- Grey Box Pentest - The tester has partial knowledge, such as login credentials.
- White Box Pentest - The tester has full access to the system architecture and source code, yielding the most accurate findings.
- Time Boxed / Budget Box Pentest - The test duration or cost determines when the test ends.
Common Vulnerabilities in Web Applications
Our penetration tests focus on vulnerabilities that cybercriminals exploit to conduct attacks, including:
- SQL Injection (SQLi) – Attackers manipulate database queries to gain access to sensitive data.
- Cross-Site Scripting (XSS) – Attackers inject malicious scripts to steal user data.
- Broken Authentication – Insecure login mechanisms that allow account compromise.
- Insecure Direct Object References (IDOR) – Unprotected endpoints allowing unauthorized access to data.
- API Security Risks – Misconfigured APIs exposing unintended access to data or systems.
- Misconfigurations – Incorrect server or application settings that create security loopholes.
Our security experts adhere to internationally recognized standards, such as OWASP Top 10 and NIST, to secure your applications against the most common threats.