Web Application Penetration Testing

Safeguard your organization with globally trusted security assessments.

Find the Flaws Before They’re Exploited

Nullayer helps you uncover and fix critical vulnerabilities in your web applications through expert, manual penetration testing. 

Secure What Matters Most

Your web applications are directly exposed to the internet—and to attackers. From customer portals and SaaS platforms to internal tools, modern applications are a top target for exploitation. At Nullayer, we go beyond automated scans to uncover business logic flaws, authentication weaknesses, and real-world exploit chains through tailored, manual testing. 

What We Test

Authentication & Session Management

We assess how your application handles identity, access, and session controls, checking for weaknesses in login, multi-factor authentication, session tokens, and logout functionality.

Authorization & Access Control

We test for privilege escalation, insecure direct object references (IDOR), and horizontal/vertical access bypasses that allow users to access unauthorized resources or functions.

Input Validation & Injection

We evaluate how your application processes untrusted input, checking for SQL injection, command injection, cross-site scripting (XSS), and other code injection vulnerabilities.

Business Logic & Workflow Manipulation

We simulate abuse of application logic to identify flaws that scanners can’t detect—such as bypassing payment flows, manipulating discount mechanisms, or disrupting multi-step workflows.

Data Exposure & Insecure Storage

We identify improper handling of sensitive data, including personal information, credentials, tokens, and encryption flaws that may lead to leakage or theft.

API Security

If your application includes APIs, we test for common and advanced flaws including broken object-level authorization, insecure endpoints, rate-limiting bypasses, and token handling issues.

Our Testing Process

Scoping and Reconnaissance

We begin by understanding your application’s architecture, threat model, and business logic. This ensures we test what matters most.

Manual Testing & Exploitation

Our testers explore and exploit vulnerabilities using proven techniques and real-world attacker methodologies, not just automated tools.

Post-Exploitation & Risk Mapping

We document not only the existence of vulnerabilities but also their potential business and technical impact.

Comprehensive Reporting & Debrief

You receive a structured, easy-to-understand report with severity ratings, proof-of-concept details, and clear, prioritized remediation steps. We walk your team through the findings and remain available to assist with fixes.

Why Nullayer

Expert, Manual Testing

Every engagement is led by experienced penetration testers with deep understanding of web security—not by scanners or checklists.

Tailored Approach

We test based on how your app actually works, adapting our methods to your platform’s architecture, logic, and threat profile.

Business-Relevant Insights

We don’t just report technical flaws—we explain what they mean in the context of your business, customers, and data.

Collaborative Remediation

Beyond identifying issues, we partner with your team to ensure vulnerabilities are effectively resolved, not just documented.

Don’t Let a Blind Spot Become a Breach

Your application is your business. Let Nullayer help you protect it—with the same mindset as the attackers trying to break it.