Web Application Security

Web application penetration testing

Testing web applications is our specialty. We find security gaps and vulnerabilities in your websites - whether SaaS or online store.

Our website penetration test provides a thorough analysis of your web applications to uncover potential security vulnerabilities. Authentication, authorization, data validation and other critical security areas are tested in detail. The latter is important because nowadays websites and web apps are the interface between the user and the server - the latter is where the interesting and sensitive data is located.

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Web Application Penetration Testing
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Damian Strobel - CEO DSecured

Damian Strobel

CEO

My Recommendation

Manual testing for complex web applications

Web applications thrive on individual business logic - that's exactly where we apply practical attack scenarios. My team and I mirror real attackers and give your developers clear guidance on how to sustainably close vulnerabilities.

What is a Web Application Penetration Test?

From an attacker's perspective, web applications are incredibly interesting. Most websites allow login functionality, which means user data (PII) will be stored in databases. In the case of online stores or SaaS platforms, it can also be assumed that users' financial data may be present. As the operator of such websites, it's therefore important to ensure that your application has no security vulnerabilities. In the worst case, attackers could steal sensitive data!

Information on costs, procedures, duration, and types of web penetration tests can be found further down on this page - they generally apply to any type of penetration test regardless of the target system. For meaningful results, we need to experience the target application in a fully functional test environment with realistic data. Please set up representatives of all user roles and provide us with appropriate scenarios.

Controlled Role Testing

We examine how permissions can be cleanly separated and whether horizontal or vertical escalations are possible.

Manual Analysis First

Burp Suite, Caido & Co. help us manipulate requests - but decisions are made by experienced pentesters.

Targeted Automation

We deliberately use automated checks, e.g., for path traversal, rate limiting, or weak configurations.

The result: a practical report with clear priorities and concrete fix recommendations - including retest once you've implemented adjustments.

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Secure data protection

Your data will be treated confidentially and will not be passed on to third parties.

Why should we perform the penetration test for your web application?

Experienced Team

Experienced Team

Benefit from our experienced team of bug bounty hunters and ethical hackers who have already conducted numerous successful web application penetration tests. Complex scopes and secured systems are no problem for us and are rather standard.

Outstanding Report

Outstanding Report

Receive detailed and understandable reports that not only identify vulnerabilities but also provide concrete and actionable recommendations. Our risk assessment is realistically tailored to your specific case.

Maximum Creativity

Maximum Creativity

Our innovative team uses creative and unconventional approaches to identify even the most hidden security vulnerabilities. We combine small flaws into critical security gaps that no one expected.

Effective Risk Minimization

Effective Risk Minimization

Protect your company through targeted tests that minimize potential security risks and secure your IT infrastructure. Black hats and cybercriminals usually don't wait long and exploit every weakness.

Tailored Communication

Tailored Communication

We adapt our communication to your needs, whether through regular updates, detailed discussions, or understandable explanations. It doesn't matter if it's via WhatsApp, Signal, or Slack. You decide!

Long-term Partnership

Long-term Partnership

Rely on a long-term collaboration that offers not just one-time tests, but continuous security optimizations and support. We can take any perspective and are your partner in security matters.

How much does a penetration test cost?

It's difficult to tell how much a test will cost because every test is individual - but we always find a solution that fits every budget.

Go to "Costs"

How often should you have a penetration test carried out?

The frequency of a pentest depends on various factors - here is an overview.

Go to "Frequency"

What types of penetration testing are there?

The word "penetration testing" is a very general word and can describe various types of testing. An overview is available here.

Go to "Types"

How does a penetration test usually work?

The process of a pentest is usually always the same - but the steps differ depending on the type of test.

Go to "Process"
Pentest Costs: Time Factor
Budget & Depth

Savings Potential in Web Application Penetration Tests

In the case of penetration tests against web applications, we are relatively flexible regarding test intensity. The degree of automation and manual testing can be adjusted according to customer preferences. The following scenarios are possible:

  • 15% manual / 85% automated Affordable, but superficial. The focus is on attack vectors that very frequently cause problems. We use almost exclusively automated scans.
  • 50% manual / 50% automated Moderate price, good quality. Here the "most interesting" requests are analyzed manually. All others are checked automatically.
  • 85% manual / 15% automated Expensive, but very thorough. Every request is analyzed in detail. The focus is on a complete manual pentest.
API Penetration Test vs Web Penetration Test
Scope & Differentiation

API Penetration Test vs Web Penetration Test

An API penetration test is essentially a web penetration test that focuses on interfaces. Modern web applications are often a JavaScript frontend (AngularJS, ReactJS, VueJS) that communicates with the backend via an API. The approach is very similar to a web app pentest. Due to the frequently available API documentation (Swagger, OpenAPI, GraphQL), we can test an API relatively quickly but thoroughly.

Relevance of Web Frameworks for Pentests
Tech Stack Know-how

Relevance of Web Frameworks for Pentests

With the rise of so-called web frameworks such as Laravel, Django, Ruby on Rails, Spring Boot (Java), and .NET, a tool has been created that makes it significantly more difficult from a developer's perspective to produce serious security vulnerabilities - provided it's used correctly - which is not always the case. Nevertheless, we find that each framework has its "peculiarities", for example, in Laravel pentests we rarely find XSS or SQL injections, but more frequently problems in the area of Mass Assignment. Java and ASP frameworks, on the other hand, more often have problems with file processing. A pentest is therefore also useful for modern web frameworks.

# Laravel Pentest # Drupal Pentest # Spring Boot Pentest # Symfony Pentest # PHP Pentest # Python Pentest # Java Pentest # ASP.NET Pentest # NodeJs Pentest
Methodology in Web Application Pentests
Methodology & Standards

Methodology in Web Application Pentests

The classic when it comes to pentest methodology in connection with web applications is the OWASP Top 10 list. It contains the most common security vulnerabilities found in web applications. The problem is: it's not all of them. An attacker is generally very creative, combining security vulnerabilities and turning them into complex attacks. We work the same way. We don't mindlessly work through lists - we look for things that could become a problem for you - isolated or in combination. Nevertheless: OWASP (see Web Security Testing Guide) as well as BSI (Pentest Execution) are the absolute standard for us.

Security Vulnerabilities in Web App Pentests

There are various types of security vulnerabilities that can be found in web applications. The examples here are real examples from past penetration tests. Here are the most common ones:

Cross Site Scripting (XSS)

An attacker can inject HTML code into the website output. This can be used to exfiltrate data from other users.

SQL Injection

This type of vulnerability allows the contents of the database to be read. Often the SQLMap tool is used for this. The attacker can thus download the entire user database, for example.

File Uploads

Upload functions often allow files to be uploaded that facilitate server takeover (shells). It's not trivial to program upload functions securely.

Server Side Request Forgery

An attacker can make the web server send requests to internal systems. This becomes particularly interesting when the web app is hosted on AWS, for example (keyword: Metadata API).

Insecure Direct Object Reference

Can an attacker read or modify the user data (or other data) of another user via the user interface?

Output of Sensitive Data

When examining requests, you often see that too much and especially sensitive data is being output. This frequently happens with logged-in administrators.

How much does a penetration test for web applications cost?

The price depends on several factors - number of features, authentication flows, API endpoints, user roles, and the desired test depth (automation vs. manual testing) significantly influence the effort.

Quick Assessment

Web App Security Quick Check

Automated + targeted manual testing

$2,700 - $6,500
3-5 testing days
  • OWASP Top 10 testing (automated + manual)
  • Burp Suite Professional automated scan
  • Manual testing of critical functions (15-25%)
  • Authentication & session management testing
  • Input validation (XSS, SQLi, IDOR)
  • Basic API security testing (REST/GraphQL)
  • Report with prioritized findings
  • Scope: Up to 50 features/endpoints
Ideal for: Startups, MVPs, small web apps, compliance baseline (ISO 27001, NIS2), budget-conscious projects
Recommended

Comprehensive Manual Web App Pentest

In-depth manual security analysis

$8,100 - $27,000
7-16 testing days
  • Fully manual analysis (80-90% manual)
  • OWASP Top 10 + OWASP ASVS Level 2/3
  • Business logic testing & workflow bypasses
  • Advanced authentication bypass (OAuth, SAML, JWT)
  • RBAC & authorization matrix testing (all roles)
  • REST/GraphQL API detailed analysis (BOLA, Mass Assignment)
  • File upload security & server-side exploits
  • CSRF, SSRF, XXE, deserialization tests
  • Client-side security (DOM XSS, Prototype Pollution)
  • WebSocket & real-time communication tests
  • Retest + executive summary + technical detailed analysis
  • Scope: Unlimited features/endpoints
Ideal for: Enterprise web apps, SaaS platforms, e-commerce, fintech, healthcare, multi-tenant applications
API-focused

Pure API Penetration Test

REST, GraphQL, gRPC, WebSocket APIs

$4,900 - $16,200
4-12 testing days
  • REST API: BOLA, BFLA, Mass Assignment tests
  • GraphQL: Introspection, batching, depth limit bypasses
  • Authentication: JWT exploits, API key leaks, OAuth flows
  • Authorization: Missing function-level AC, IDOR in APIs
  • Rate limiting & abuse tests
  • API schema validation (OpenAPI, Swagger)
  • gRPC & WebSocket security testing
  • Automated API fuzzing + manual verification
  • Scope: 30-200 endpoints depending on complexity
Ideal for: Headless CMS, mobile backends, microservices, API-first architectures, integration platforms
Framework-specific

Framework-specific Pentest

Laravel, Django, Spring Boot, .NET, etc.

$5,400 - $19,400
5-14 testing days
  • Framework-specific vulnerabilities (Mass Assignment, SSTI)
  • Laravel: Mass Assignment, Eloquent Injection, Blade SSTI
  • Django: ORM bypasses, template injection, Pickle RCE
  • Spring Boot: SpEL Injection, Actuator exploits, deserialization
  • .NET: ViewState manipulation, deserialization, XXE
  • Code review support (optional whitebox approach)
  • Dependency scanning (OWASP Dependency Check)
  • Complete OWASP Top 10 + framework best practices
Ideal for: Custom-developed apps, framework-based projects, whitebox pentests with code access

Scope factors: The price is determined by the number of features/endpoints, user roles, authentication flows (OAuth, SAML, MFA), frontend complexity (SPA vs. server-side rendered), API types (REST, GraphQL, gRPC), third-party integrations, and desired test depth (automated vs. manual). For very large enterprise platforms (500+ endpoints, multi-tenancy, microservices), we create custom quotes.

Automation vs. Manual Testing

15% manual

Focus on automation: Burp Suite scan plus manual verification of critical findings. Good for budget projects and quick baseline analyses.

$2,700 - $6,500
50% manual

Balanced approach: Automated scans for breadth, manual tests for critical functions. The optimal middle ground between cost and quality.

$5,400 - $13,000
85% manual

Focus on manual: Every request is manually analyzed. Business logic vulnerabilities, complex bypasses, race conditions - maximum depth.

$10,800 - $27,000
Request a non-binding quote

We would like to test the security of your web application.

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Trust through experience

Some companies we have been able to help

We've had the privilege of working with some of the world's leading companies and strengthening their IT security.

Pentest: Services

API Penetration Testing

Modern websites and SPAs usually communicate with some kind of API.

Vulnerability Scanning

Fully automated vulnerability scanning for your IT infrastructure or application.

Questions About Web Application Penetration Testing

How long does a typical web application penetration test take?

The duration of a web application penetration test can vary greatly, but typically depends on the complexity and scope of the application. Smaller projects could be reviewed quickly within a few days, while more extensive applications may require weeks.

What types of security vulnerabilities can be uncovered during a web application penetration test?

A web app pentest often identifies CSRF and XSS, SQL injections, security vulnerabilities in authentication and session management. RCE and code injections as well as configuration errors are also common findings.

How is the final report of a web application penetration test structured?

The final report of a web application penetration test includes an executive summary, technical details of identified vulnerabilities, and tailored recommendations for action. Top priority is on the reproducibility of findings (POC||GTFO) and elimination of false positives.

What added value does a pentest for web applications provide for my company?

You proactively ensure that an attacker has significantly more difficulty hacking your project, stealing data, or penetrating deeper into your company. You minimize the risk of a cyber incident, bad PR, and disappointed customers.

Can a single pentest reveal all problems of an application?

A good penetration test should uncover all critical security vulnerabilities. However, IT is much more complex and there is no guarantee that a single test will identify all vulnerabilities. IT security is ALWAYS a process and not a one-time project. And this process tries to minimize the probability of being hacked as much as possible.

Who conducts the penetration tests for web applications?

Depending on the target and scope, we assemble a competent team of experienced penetration testers. Our experts have years of experience and are able to test even complex applications. We place great emphasis on the quality of our work and the satisfaction of our customers.

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