A web application penetration test is crucial to proactively ensure the security of your online services. Web applications are very often accessible from the internet and therefore a prime target for cyber attacks. Vulnerabilities can have an impact deep into the underlying systems (e.g. remote code execution). Even a single, undetected vulnerability can therefore have serious consequences – from data loss and reputational damage to legal consequences.
Web Application Penetration Testing
Web applications are exposed to a wide range of potential vulnerabilities and can provide critical functions at the same time. We help you find them and fix them effectively.
Why carry out a web application penetration test?
Targeted testing in accordance with established standards such as the Open Web Application Security Project (OWASP) allows potential points of attack to be identified and eliminated at an early stage before they are exploited by real attackers. This not only increases technical security, but also strengthens the trust of customers, partners and supervisory authorities.
Common vulnerabilities in web applications
Web applications often have recurring vulnerabilities that can allow attackers to access confidential data or manipulate functions. These vulnerabilities are often caused by a lack of secure coding specifications, insufficient validation or incorrect configurations. The most common vulnerabilities include
- ineffective access controls – unauthorized access to sensitive areas or data.
- SQL injection – Exploitation of insecure database queries to manipulate or steal data.
- Cross-Site Scripting (XSS) – Injection of malicious code into websites for execution in the user’s browser.
- Cross-Site Request Forgery (CSRF) – Forcing unwanted actions on behalf of a logged-in user.
- insecure authentication and session management – allows user accounts to be taken over.
- disclosed sensitive information – disclosure of confidential data due to incorrect configuration or logging.
How we support you
We simulate attacker behavior to uncover vulnerabilities in key areas such as authentication, access control, input processing, session management and business logic. Our methodology combines automated analysis with a manual approach, in accordance with the OWASP Web Security Testing Guides and relevant vendor specifications regarding secure configurations.
Targeted attack simulations
We simulate targeted attacks on your web applications under real conditions – using manual methods and specialized tools that go far beyond automated scans. This is how we uncover vulnerabilities that others overlook.
Complex web stack know-how
Our know-how and our assessments include all layers of modern web applications (e.g. JavaScript-based single-page applications, Rest APIs, websocket services, etc.) including the associated cloud and server infrastructure.
In-depth analyses
To do justice to a defense-in-depth approach, we can also apply a grey-boxed or white-boxed approach. We check configurations of involved components (e.g. servers, container solutions, proxies, …), hardening and carry out tool-supported source code analyses.
Results of our web application penetration tests
Standards we use
Our web penetration tests are performed based on the best practices defined by the following standards:
- OWASP Top10: 2025
- Application Security Verification Standard (ASVS) Level 1 – 3
- NIST Cyber Security Framework (CSF)
- Web Security Testing Guide (WSTG)
