# Web Application Penetration Testing and Security Test Service (OWASP Pentest)

**URL:** https://securesys.com.tr/en/services/web-application-security-test-service

### Secure Your Corporate Web Applications Against Real Cyber Attacks

As digital transformation accelerates, web applications have become one of organisations' most critical assets. E-commerce platforms, internet banking systems, ERP and CRM applications, customer portals, public services and custom software solutions serve millions of users every day. Yet this accessibility also creates a major opportunity for cyber attackers.

A misconfigured authentication mechanism, missing access controls or a seemingly simple coding error can lead to the theft of customer information, financial loss, service outages and serious damage to corporate reputation.

The SecureSys Web Application Penetration Testing Service evaluates your web applications from the perspective of a real attacker to reveal security vulnerabilities. Rather than relying only on automated scanning tools, our experts apply manual testing, business logic analysis and advanced attack scenarios to measure your system's true security level.

### What Is a Web Application Penetration Test?

A Web Application Penetration Test is a controlled and authorised security test carried out to measure the security level of web applications accessible over the internet or running within a corporate network. In these tests, ethical hackers apply the techniques a real attacker could use, in a controlled way, to detect critical vulnerabilities such as [SQL Injection](/en/learning/web-application-security/what-is-sql-injection-types-prevention), [Cross-Site Scripting (XSS)](/en/learning/web-application-security/what-is-cross-site-scripting-xss-prevention), [Broken Authentication](/en/learning/web-application-security/authentication-session-management-security-mfa), [Broken Access Control](/en/learning/web-application-security/broken-access-control-idor-bola), SSRF, XXE, insecure file upload, [API security vulnerabilities](/en/learning/web-application-security/api-security-owasp-api-security-top-10) and [business logic flaws](/en/learning/web-application-security/business-logic-security-vulnerabilities).

The result of a penetration test is not merely a list of vulnerabilities; for each finding, the technical explanation, potential business impact, CVSS risk score, exploitation scenario and actionable remediation recommendations are reported in detail (see [deliverables](/en/learning/web-application-security/penetration-testing-deliverables-reporting)).

### Why Is a Web Application Penetration Test Necessary?

Cyber attacks now target businesses of every size, not just large organisations. Through a professional web application penetration test, critical vulnerabilities are detected before attackers, the risk of a data breach is reduced, business continuity is supported, and compliance processes with standards such as KVKK, ISO 27001 and PCI DSS are strengthened.

### Scope: OWASP Top 10 and Beyond

Our tests cover all [OWASP Top 10](/en/learning/web-application-security/owasp-top-10-tested-security-vulnerabilities) categories, but do not stop there. SecureSys experts also reveal application-specific logical and business-process risks that automated scanners miss, through manual analysis. The testing process is based on an internationally recognised [methodology](/en/learning/web-application-security/web-application-penetration-testing-methodology) (OWASP WSTG, PTES, NIST SP 800-115, CVSS v4.0).

### Who Should Have a Web Application Penetration Test?

Regular penetration testing is critical for every organisation that uses web applications. It is indispensable in particular for banks, insurance companies, public institutions, municipalities, universities, hospitals, e-commerce platforms, telecom operators, energy companies, defence-industry organisations and SaaS/cloud service providers. Test frequency varies by sector — see our [how often to test](/en/learning/web-application-security/how-often-should-you-run-penetration-testing) page for details.

### Why SecureSys?

The success of a web application penetration test does not depend on the tools used alone. When the same application is tested by different teams, very different results can emerge — because of differences in expertise, methodology, sector experience and reporting quality.

- **Methodology aligned with international standards** — OWASP WSTG, OWASP Top 10, PTES, NIST SP 800-115, CVSS v4.0.
- **Manual-analysis-focused approach** — business logic analysis, authorization controls, session management, chained attack scenarios.
- **API and modern architecture expertise** — REST API, GraphQL, micro-service architectures, mobile application services.
- **Business logic security analysis** — payment processes, campaign mechanisms and order flows are analysed through real user scenarios.
- **Technical and managerial reporting** — a detailed technical report and an executive summary for senior management are prepared separately.
- **Support during remediation** — verification of fixes through re-test work.
- **Project experience across sectors** — finance, healthcare, public sector, e-commerce, defence industry.
- **Continuous security approach** — periodic assessments, pre-release checks, security consultancy.

### Checklist for Choosing a Service Provider

| Question | Why It Matters |
| --- | --- |
| Is an international methodology used? | So that tests are systematic and repeatable |
| Is manual analysis performed? | To detect risks that automated tools miss |
| Is API security assessed? | Because it is a major attack surface of modern applications |
| Are business logic tests carried out? | To identify financial and operational risks |
| Are technical and executive reports prepared separately? | To meet the needs of different stakeholders |
| Is re-test support provided? | To verify the remediations |

### Frequently Asked Questions

For duration, pricing, the difference between Black/Gray/White Box and more, see our [Frequently Asked Questions](/en/learning/web-application-security/web-application-penetration-testing-faq) page.

### Get a Quote Now

Assess the security level of your web application from an independent, expert perspective. SecureSys experts test your application with real attack techniques to reveal critical vulnerabilities, prioritise your risks and provide actionable remediation recommendations. Take action before cyber threats materialise — get in touch to request a free preliminary assessment.