Web application penetration testing

Why web application security fails

Web applications are complex. You have frontend Javascript. You have backend servers. You have databases. You have third-party APIs. Every single connection point is a risk.

Developers write code to make things work. They focus on the happy path. A user clicks a button, and the system saves a file. Hackers focus on the dark paths. What happens if a user clicks the button ten times in one second? What happens if the user changes the file ID in the URL?

We act exactly like hackers. We hunt for the dark paths in your web application. We test every input field. We manipulate every request. We break the rules to see how your server responds. We prove exactly how easy it is to steal your data.

The Simpa Labs web testing methodology

We run deep manual analysis across a structured, repeatable process. Every phase builds on the previous one.

Step 1: Application Mapping and Reconnaissance

We map out your entire web application. We find every single page. We find the hidden admin panels you forgot to delete. We find the old API versions you left running. We intercept the web traffic. We study exactly how the frontend talks to the backend. We identify the exact technology stack you use.

Step 2: Authentication and Session Testing

We attack your front door. We test your login pages. We try to guess user passwords using massive dictionaries. We bypass your Two-Factor Authentication (2FA). We steal session cookies. We test if a user stays logged in after they click logout. We make sure your authentication system is bulletproof.

Step 3: Authorization and Access Control Testing

Once we get inside the app, we test the boundaries. We check if User A can view User B's private messages. We check if a basic user can force the server to grant them admin rights. This is the most critical phase. Broken access control is the leading cause of massive data breaches today.

Step 4: Input Validation and Injection Testing

We send bad data to your server. We type SQL commands into your search bars. We upload malicious files to your profile picture forms. We inject Javascript into your comment boxes to attack other users. We test how your backend handles poison data.

Step 5: Business Logic Testing

This is where we shine. We attack the custom rules of your specific business. If you run an e-commerce site, we try to buy a television for one cent. If you run a bank, we try to transfer a negative amount of money to increase our own balance. Scanners never find these bugs. Only a human expert finds them.

Specific web vulnerabilities we hunt

We test your web application against the OWASP Top 10 standard. We go much deeper than the baseline checks. Here are the specific attacks we launch against your system.

Broken Object Level Authorization (BOLA)

We check every URL parameter. We check every hidden form field. We see if we can manipulate an ID to access data we do not own. If your invoice link ends with `invoice_id=100`, we change it to `invoice_id=101`. If your server shows us a stranger's invoice, you have a fatal BOLA vulnerability. We hunt for BOLA in every test.

Cross-Site Scripting (XSS)

We inject malicious Javascript into your application. We force your application to serve our script to your legitimate users. Our script steals their session cookies and sends them to our attack server. We test Reflected XSS, Stored XSS, and DOM-based XSS on modern Javascript frameworks.

SQL and NoSQL Injection

We talk directly to your database. We bypass your application logic entirely. We send raw SQL queries through your input fields. We force your database to dump the entire user table. We also test modern NoSQL databases like MongoDB for injection flaws.

Server-Side Request Forgery (SSRF)

We trick your web server into attacking itself. If your app fetches images from an external URL, we change the URL to `localhost:1234`. We force your server to scan its own internal network. We read internal AWS metadata keys. We pivot from the web app into your secure private cloud.

Race Conditions and Concurrency Flaws

We send fifty requests to your server at the exact same millisecond. We test how your database handles concurrent locks. If you offer a signup bonus, we click the claim button fifty times instantly. If the server credits the bonus fifty times instead of once, you have a race condition. We build custom scripts to find these timing flaws.

The tools we use to break your web app

We use advanced offensive security tools. We build custom scripts for your specific app.

• Burp Suite Professional: We route all web traffic through Burp. We intercept and modify every single HTTP request before it hits your server.
• Custom Python Scripts: We write bespoke Python scripts to exploit complex race conditions and bypass rate limits.
• SQLMap: We use advanced exploitation frameworks to extract data deeply from vulnerable databases.
• FFuF and Gobuster: We aggressively fuzz your web directories to find hidden files, old backups, and exposed git repositories.
• Browser DevTools: We reverse engineer your minified React and Vue Javascript bundles to find hidden API endpoints directly in the browser memory.

The final delivery and remediation process

We provide massive value after the test is over. We give you a detailed technical report that actually helps your developers.

We rank every bug by severity using the CVSS framework. We provide the exact HTTP request and response logs. We write out the exact steps to reproduce the attack. Your engineers do not have to guess. They can copy and paste our steps to see the bug happen on their own screens.

We give you precise code snippets to fix the vulnerabilities. We show you how to parameterize your SQL queries. We show you how to implement anti-CSRF tokens. We show you how to set secure cookie flags.

We get on a call with your team. We explain the risks plainly. You fix the code. We retest the application to prove the fix works. We issue a clean security certificate.

Regulatory compliance and auditor trust

Enterprise clients demand proof of security before they buy your software. Regulators demand proof of security before they grant you a license. We give you that proof.

We map every single vulnerability we find to the OWASP Top 10 standard. We map our tests to PCI DSS requirements. We map our tests to SOC 2 controls. We map our tests to the NDPA privacy laws.

You hand our report to your auditors. They see a rigorous, professional assessment. You pass your compliance checks easily. You close your massive B2B enterprise deals faster because you prove you take security seriously.