Web Application Penetration Testing

Andersen delivers web application penetration testing that uncovers OWASP Top 10 vulnerabilities and business logic flaws. Our certified testers combine manual testing and code-level analysis to provide actionable remediation guidance, with a re-test included.

Application security expertise proven in numbers

Andersen delivers security assessments across financial services, healthcare, and enterprise IT environments worldwide.

Certified penetration testers with OSCP, CEH, GWAPT, and CREST qualifications conduct structured web application security testing.

Web, API, mobile, network, and infrastructure assessments completed for clients across regulated industries globally.

Web application penetration testing services we offer

We perform custom web app penetration testing for product and engineering teams preparing high-risk releases, mapping attack surface and confirming exploitable paths before launch. This web application penetration test helps organizations prioritize fixes and reduce production breach risk.

What you receive:

Detailed vulnerability report with severity rating and proof of concept (PoC) for each finding;
Code-level fix guidance mapped to specific functions and files;
Free re-test after remediation to confirm identified security weaknesses are resolved.

Andersen runs API penetration testing for SaaS and platform teams preparing SOC 2 or PCI DSS reviews, validating REST and GraphQL API endpoints for authentication bypass, broken object-level authorization, and mass assignment. The engagement reduces unauthorized data access risk through prioritized remediation actions.

Testing scope:

Authentication and authorization checks across all user roles;
Input validation, rate limiting, and error handling behavior;
Data exposure in API responses and headers.

Our team evaluates SPAs for frontend teams that release UI changes weekly and need authenticated-user coverage before major launches. We test client-side attacks, DOM-based XSS, insecure token storage, and dependency risks to reveal exploitable weaknesses before production.

Assessment scope:

Client-side security analysis of JavaScript frameworks and third-party libraries;
Token and session lifecycle testing across multiple user roles;
DOM-based injection and data flow analysis.

Andersen tests progressive web apps for mobile-first product teams deploying offline workflows and push messaging at scale. We assess service worker misconfigurations, insecure caching, and background sync abuse, giving teams a clear fix plan before customer rollout.

What we examine:

Service worker security and cache poisoning risks;
Offline storage and data handling controls;
Push notification and background sync abuse vectors.

Our penetration testers assess payment applications for e-commerce teams preparing peak-season releases and PCI DSS validation. We test checkout flows, gateway integrations, and session management to identify exploit paths that could trigger unauthorized transactions and chargeback losses.

PCI DSS-aligned testing includes:

Checkout flow and payment gateway security validation;
Cardholder data handling and storage assessment;
Session lifecycle and access control testing across PCI DSS scope.

Andersen evaluates SaaS platforms for multi-tenant product teams preparing enterprise onboarding and contract-driven security checks. We test isolation failures, privilege escalation, web interfaces, and API endpoints to prevent cross-tenant impact and reduce customer-facing risk.

Testing deliverables:

Multi-tenant isolation and privilege escalation testing;
API endpoint and admin panel security assessment;
Compliance-ready report for SOC 2 and NIST audit evidence.

Meet our expert

Vladimir Pedchenko
Senior Director of Managed Services and Security

15+

Years in IT Ops and Security

150+

Active service contracts

99.99%

Uptime for 10% of SLAs

At Andersen, Vladimir leads IT operations and security services, keeping customer systems secure and stable.

Builds and leads high-performing and scalable IT teams;
Ensures reliability and resilience across critical systems;
Leads large-scale transformations and process improvements.

Benefits of web application penetration testing

Andersen's web app penetration testing identifies exploitable weaknesses before attackers find them, reducing remediation costs, accelerating compliance, and protecting customer data.

Prevent breaches before attackers strike

Andersen uncovers exploitable security weaknesses before attackers exploit them, reducing breach risk and protecting sensitive data, operational continuity, and organizational reputation.

Meet compliance requirements faster

Andersen's web app pen test delivers compliance-ready reports for PCI DSS, HIPAA Security Rule, SOC 2, and ISO 27001 — providing audit evidence and prioritized remediation actions your security team can apply immediately.

Protect customer data and brand trust

Andersen tests authentication, access controls, and session management to prevent unauthorized exposure of customer accounts and sensitive data — protecting both user privacy and brand trust.

Reduce security costs with early detection

Andersen identifies security vulnerabilities pre-release and provides remediation guidance to help reduce post-breach costs, which average USD 4.4 million globally.

Release new features with confidence

Andersen validates new functionality against known attack patterns before each release, so development teams can ship code without accepting unquantified security risk or delaying go-live.

Our security certifications and recognitions

Andersen's web application security engineers hold OSCP, GWAPT, CREST, and CISSP certifications, supporting PCI DSS, HIPAA Security Rule, SOC 2, and GDPR compliance requirements.

Web app pentesting approaches

Black box penetration testing services

Andersen simulates an external attacker with no prior knowledge of the target application. Testers perform reconnaissance, enumeration, and vulnerability analysis using only publicly available information and the application's external interface. The assessment reveals security vulnerabilities exposed to external attackers.

Grey box penetration testing services

Our testers work with partial application knowledge — credentials, architecture diagrams, or API documentation — replicating a scenario where an insider or compromised account attempts exploitation. This method uncovers security vulnerabilities that require authenticated access while balancing testing depth with efficiency.

White box penetration testing services

Full access to source code, architecture documentation, and configurations enables static analysis alongside dynamic testing. This method delivers the most comprehensive vulnerability coverage, including code-level fix guidance for every finding.

Vulnerabilities our web application pen tests uncover

Authentication and session flaws

Andersen uncovers broken authentication flows, weak token handling, and session management flaws that allow attackers to bypass access controls and gain unauthorized access to sensitive data.

Broken access control

Andersen tests access controls across all user roles to identify privilege escalation, broken object-level authorization, and IDOR flaws that expose restricted application functionality.

Injection vulnerabilities

Andersen validates all input entry points for SQL injection, command injection, and XML injection flaws that enable attackers to read, modify, or destroy application data.

Why choose Andersen for web application penetration testing

Andersen delivers web application pen testing with certified engineers, a manual-first security testing methodology, and compliance-ready reporting that produces measurable, verifiable results.

OSCP, CEH, and GWAPT-certified engineers

Andersen's web application security engineers hold OSCP, CEH, GWAPT, and CREST certifications. These security qualifications confirm hands-on offensive security expertise validated by independent accreditation bodies.

Penetration testing beyond automated vulnerability scanning

Andersen combines manual exploitation with automated scanners, uncovering security vulnerabilities that purely automated tools miss — including business logic flaws, auth bypass, and complex multi-step attack chains.

ISO 27001 and SOC 2-audited processes

Our security testing methodology is delivered through ISO 27001 and SOC 2-audited processes, producing documented evidence that satisfies external audit requirements without additional compliance overhead.

Actionable remediation guidance for development teams

Andersen delivers code-level fix guidance for each finding — specifying which function or component requires change and how to verify the fix. Development teams receive working exploit demonstrations, not just vulnerability findings.

Experience across regulated industries

Andersen has delivered security testing engagements across financial services, healthcare, and SaaS platforms subject to PCI DSS, HIPAA Security Rule, and SOC 2 — reducing audit preparation time for clients.

Flexible engagement models for different security needs

We support fixed-scope engagements, rolling security retainers, and release-gated testing gates — so your security testing cadence aligns with development velocity and budget constraints.

Our web application penetration testing methodology

Andersen delivers a structured web app penetration testing process — from threat modeling and scoping to exploitation, impact analysis, and free re-testing after remediation.

Andersen works with stakeholders to define the test scope — web application URLs, interfaces, user roles, and test boundaries. We prioritize risk profile, compliance requirements, and business-critical functionality for deeper coverage.

Scope document with defined targets, exclusions, and testing windows;
Risk profiling to prioritize high-value attack surfaces;
Rules of engagement aligned with production stability requirements.

Andersen runs automated scanners across the application to baseline known vulnerability classes through dynamic analysis. Automation identifies low-complexity issues efficiently so manual testing time focuses on business logic and logic-dependent attack scenarios.

Vulnerability scanning with commercial and open-source tools;
False positive triage and finding validation before manual testing begins;
Scan coverage of all identified endpoints and parameters.

Our penetration testers manually probe every attack surface using exploitation techniques aligned with the OWASP Testing Guide, PTES, and NIST. Each vulnerability is confirmed with a proof of concept (PoC) or working exploit to demonstrate real business impact.

Manual injection, XSS, and authentication bypass testing;
Business logic exploitation and multi-step attack simulation;
Working exploit or PoC documented for every confirmed finding.

Andersen assesses post-exploitation potential after confirming vulnerabilities by analyzing accessible critical records, privilege escalation, and realistic business impact. This evaluation converts technical findings into measurable risk for stakeholders.

Lateral movement and privilege escalation assessment;
Data exposure quantification and impact scoring;
Risk profile update based on confirmed exploitation paths.

Andersen delivers a compliance-ready report covering every finding with severity rating, root cause analysis, exploit evidence, and code-level fix guidance. A debrief session walks technical and non-technical stakeholders through results and remediation priorities.

Executive summary for non-technical stakeholders;
Technical vulnerability detail with prioritized fix actions per finding;
Compliance mapping to PCI DSS, HIPAA Security Rule, SOC 2, and NIST requirements.

Andersen supports development teams through remediation with clarification calls and code review assistance. A free re-test confirms that implemented changes resolve the security vulnerabilities identified during the engagement.

Fix-plan clarification and developer Q&A sessions;
Fix verification through targeted re-testing of affected components;
Updated report confirming remediated findings before final delivery.

Get your web app penetration testing cost estimate

Testimonials

Andersen delivers penetration testing that clients trust for its depth, transparent reporting, and actionable fix guidance. Here is what our clients share about working with us.

FAQ

Web application penetration testing is a manual, goal-driven security assessment that validates exploitable risk, unlike automated vulnerability scanning, which only flags potential issues. It supports cybersecurity programs by confirming real attack paths before release.

OWASP Top 10 vulnerabilities and injection attacks;
Business logic flaws and access control weaknesses;
Authentication bypass and session management issues;
API endpoint security, sensitive data exposure, and source code-assisted testing findings.

Regular security testing is recommended, with annual testing as a baseline in SOC 2 and HIPAA Security Rule environments.

Annual web app pen testing as a baseline security check;
Testing after major releases, new features, or significant infrastructure changes;
Testing before go-live for new web applications;
More frequent cycles for PCI DSS compliance — quarterly for higher-risk environments to lower data breach probability.

Web penetration testing services map to core compliance requirements and provide audit-ready evidence for each framework, and many programs also include cloud penetration testing, network infrastructure testing, mobile security testing, and controlled social engineering exercises.

PCI DSS — requires annual penetration testing and quarterly vulnerability scanning for in-scope systems;
SOC 2 — penetration testing supports the Availability and Security criteria under Trust Services;
HIPAA Security Rule — security testing supports administrative and technical safeguard requirements;
ISO 27001 — penetration testing provides evidence for Annex A controls on vulnerability management and GDPR data protection measures.

Choose a web app pen testing company by validating offensive security depth, delivery quality, and remediation support.

Certifications — look for OSCP, CEH, GWAPT, or CREST-certified testers;
Methodology — confirm whether the engagement is manual-first or scanner-dependent;
Reporting quality — request a sample report to verify findings include PoC, code-level fix guidance, and compliance mapping;
Re-test policy — confirm whether a free re-test is included after remediation;
Industry experience — check for relevant case studies in your sector and evidence of offensive security depth.

Production testing is safe when scope, controls, and operations are coordinated before execution.

Testing windows are agreed in advance to avoid peak-load periods;
Destructive actions — such as data deletion or denial-of-service simulation — are excluded by default;
All activity is authorized and documented in the rules of engagement before testing begins;
For sensitive environments, testing can be performed against a staging environment that mirrors production.

Let's discuss how Andersen can secure your web application

What happens next?

An expert reaches out to you after having delved into your requirements;

If requested, we sign an NDA to guarantee the highest privacy level;

Andersen submits a comprehensive project proposal containing estimates and timelines.

Customers who trust us

Web Application Penetration Testing

Application security expertise proven in numbers

Web application penetration testing services we offer

Custom web application penetration testing

API penetration testing

Single-page application security testing

Progressive web app penetration testing

E-commerce and payment application testing

SaaS platform penetration testing

Meet our expert

Benefits of web application penetration testing

Prevent breaches before attackers strike

Meet compliance requirements faster

Protect customer data and brand trust

Reduce security costs with early detection

Release new features with confidence

Our security certifications and recognitions

Web app pentesting approaches

Black box penetration testing services

Grey box penetration testing services

White box penetration testing services

Vulnerabilities our web application pen tests uncover

Authentication and session flaws

Broken access control

Injection vulnerabilities

Why choose Andersen for web application penetration testing

OSCP, CEH, and GWAPT-certified engineers

Penetration testing beyond automated vulnerability scanning

ISO 27001 and SOC 2-audited processes

Actionable remediation guidance for development teams

Experience across regulated industries

Flexible engagement models for different security needs

Our web application penetration testing methodology

Scoping and test planning

Reconnaissance and attack surface analysis

Automated security scanning

Manual testing and exploitation

Post-exploitation and impact analysis

Reporting and debrief

Remediation support and re-testing

Get your web app penetration testing cost estimate

Testimonials

FAQ

What is web application penetration testing?

How much does a web application penetration test cost?

How long does a web application penetration test take?

How often should web applications be pen tested?

What is the difference between a web app pen test and automated vulnerability scanning?

Which compliance requirements does web application penetration test cover?

How do I choose a web application penetration testing company?

Is penetration testing safe for a production web application?

Let's discuss how Andersen can secure your web application

Let's discuss how Andersen can secure your web application