Make sure that hackers don't stand a chance with our ASP.NET pentests. We search for vulnerabilities and provide you with detailed reports that your IT team can implement. We combine manual and automated tests as well as unique know-how.
What we test in ASP.NET projects
Razor Pages, MVC Controllers, Web API, SignalR and Middleware Chains for Authorization Bypasses and Configuration Issues.
ORM Security, LINQ Injection Vectors, Raw SQL Queries and Mass Assignment Vulnerabilities in DTO Mapping.
IIS Misconfigurations, Directory Listing, Backup File Exposures (bin.zip) and Debug Mode in Production.
ASP.NET is Microsoft's enterprise framework for complex web applications and APIs - dominant in the finance, insurance and government sectors. The platforms are large, complex and data-intensive. Despite solid framework defaults, custom authorization logic, Entity Framework misuse, IIS misconfigurations and deployment errors regularly lead to critical vulnerabilities - from IDOR to Path Traversals to Source Code Leaks.
IDOR & Authorization Bypasses Missing controller-level authorization, insecure policy-based authorization, custom claims handling errors and Entity Framework query bypasses - ASP.NET projects are vulnerable to authorization issues.
IIS & Deployment Security Directory Listing, bin.zip backups, Debug Mode in Production, verbose error messages and .config file exposures - IIS misconfigurations enable source code leaks and attack surface mapping via decompilation (dnSpy, ILSpy).
Entity Framework & Data Access LINQ injection vectors, insecure raw SQL queries, mass assignment vulnerabilities in DTO mapping and ORM query bypasses - Entity Framework is powerful but error-prone with custom queries.
We deliver prioritized results with PoC code, concrete fix recommendations for your dev team and - if desired - management summaries for stakeholders and compliance audits.
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Leave us your contact details so that we can send you a non-binding, customized offer.
Your data will be treated confidentially and will not be passed on to third parties.
In bug bounty hunting we see many ASP.NET applications - and have gained considerable experience with it.
Our reports are very detailed and contain all the necessary information to fix the vulnerabilities found.
Our innovative team always thinks one step ahead and finds even the most unusual vulnerabilities.
Protect your company from financial damage and reputational damage through a comprehensive security audit.
We adapt our communication to your needs, whether through regular updates, detailed meetings or understandable explanations. It doesn't matter whether via WhatsApp, Signal or Slack. You decide!
Rely on long-term cooperation and benefit from our know-how and experience.
ASP.NET pentests uncover a broad spectrum of vulnerabilities - from authorization bypasses to IIS misconfigurations to Entity Framework issues and OWASP Top 10.
Missing [Authorize] attributes, insecure policy-based authorization, custom claims handling errors and Entity Framework filter bypasses - ASP.NET is highly vulnerable to IDOR and authorization issues, especially in multi-tenancy and complex role models.
Directory Listing + bin.zip backups = decompiled DLLs via dnSpy/ILSpy. .config file exposures, Debug Mode in Production, verbose error messages and Web.config leaks reveal connection strings, API keys and business logic.
Path traversal vulnerabilities in file download controllers, insecure file upload validation, missing content type checks and directory traversal via routing parameters - classic in ASP.NET projects.
LINQ injection vectors in dynamic queries, insecure raw SQL (FromSqlRaw/ExecuteSqlCommand), mass assignment vulnerabilities in DTO mapping and ORM query bypasses via insecure where clauses.
Despite auto-encoding: @Html.Raw(), insecure JavaScript serialization, missing ValidateAntiForgeryToken attributes and custom HTML helpers lead to XSS. CSRF at API endpoints without [ValidateAntiForgeryToken].
Connection strings in appsettings.json, API keys in Web.config, insecure secrets in code, missing encryption for sensitive data and debug symbols in production - configuration issues are common.
When IIS misconfigurations expose bin.zip backups or individual DLLs, we use dnSpy and ILSpy for decompilation - perfect for whitebox analysis and source code reconstruction.
dnSpy is a debugger and decompiler for .NET assemblies. We use it to decompile bin.zip leaks or exposed DLLs and reconstruct the original source code - including business logic, secrets and vulnerability hotspots.
ILSpy is an open-source alternative to dnSpy - cross-platform, fast and perfect for code reconstruction. Ideal for pentests with bin.zip leaks or when directory listing exposes individual DLLs. We use it for business logic analysis and vulnerability research.
Pentest practice: IIS + Directory Listing → bin.zip download → dnSpy/ILSpy decompilation → full source code access. Connection strings, API keys and business logic flaws become immediately visible.
The price depends on complexity - simple APIs vs. enterprise portals with multi-tenancy, complex authorization and extensive Entity Framework queries make the difference.
For simple Web APIs & Services
For Enterprise Portals & Multi-Tenancy
Our Mini Pentest for ASP.NET tests ViewState manipulation, identity bypasses, deserialization exploits and XXE vulnerabilities. Perfect for legacy modernizations or as a security gate before cloud migrations.
Focused examination of the most critical vulnerabilities
Transparent fixed price - no hidden costs
Fast, actionable reporting as ticket list
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A large part of the internet is based on websites and web applications.
Modern websites and SPAs usually communicate with some kind of API.
Fully automated vulnerability scanning for your IT infrastructure or application.
We've had the privilege of working with some of the world's leading companies and strengthening their IT security.
This primarily depends on the complexity of your ASP.NET application. Other factors are the size and depth of testing. As a rule, a test takes between 1-2 weeks.
We cover all relevant security areas, including but not limited to SQL injections, XSS and authentication issues.
Of course - we write a comprehensive report with all the important information that allows you to fix all vulnerabilities.
It depends on the objective, but a good start is reviewing the documentation and code quality. Installing a suitable test environment with demo data can also be helpful.
You have actively reduced the risk of a hacker stealing your data. You can also be sure that your application complies with applicable security standards.
Most often you'll read "at least once a year" - this should be understood as a guideline. You should get a feel for how often your application should be tested. If there are frequent major changes, you should also test more often.
Have questions about our services? We'd be happy to advise you and create a customized offer.
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