Offensive Security
Web Application Penetration Testing
Manual and tool-assisted testing of web applications and APIs against the OWASP Testing Guide and ASVS to find exploitable flaws before attackers do, performed under written authorization.
Overview
Web application penetration testing examines the security of your web applications, portals, and supporting APIs. It answers a practical question for product and engineering leaders: can an attacker abuse authentication, business logic, or input handling to reach data or functions they should never access?
Testing follows the OWASP Web Security Testing Guide (WSTG) and is measured against the OWASP Application Security Verification Standard (ASVS). Scope can include authenticated and unauthenticated roles, session management, access control, injection, file handling, and API endpoints, tailored to how the application is built and used.
Benefits
- Uncovers exploitable vulnerabilities in authentication, access control, and business logic that automated scanners routinely miss.
- Validates input handling and API security against injection, misconfiguration, and data exposure risks.
- Aligns results with OWASP WSTG and ASVS so findings are structured, repeatable, and easy to track.
- Provides developers with clear reproduction steps and remediation guidance mapped to each finding.
Methodology
- 01
Scoping and Authorization
Agree target applications, roles, test data, and rules of engagement, and obtain written authorization before testing starts.
- 02
Reconnaissance and Mapping
Enumerate application content, entry points, and APIs to build a test plan aligned with the OWASP WSTG.
- 03
Vulnerability Assessment
Combine manual testing and tooling to examine authentication, session management, access control, and input validation.
- 04
Exploitation
Safely confirm impact for identified issues, such as injection, broken access control, or business logic abuse, with proof of concept.
- 05
Verification Against ASVS
Assess coverage and severity against OWASP ASVS levels to give context and consistency to each finding.
- 06
Reporting and Retesting
Document findings with remediation guidance and validate fixes through retesting once changes are deployed.
Deliverables
- 01Executive Summary
- 02Technical Findings
- 03Risk Ratings
- 04Proof of Concept
- 05Remediation Recommendations
- 06Final Report
- 07Retesting Validation Report
Related offensive security services
- Red TeamingGoal-based adversary simulation that tests how well your people, processes, and technology detect and respond to a realistic, multi-stage attack, performed under written authorization.
- Network Penetration TestingExternal and internal network testing guided by PTES and NIST SP 800-115 to find and safely exploit weak services, poor segmentation, and paths to sensitive systems, under written authorization.
- Mobile Application Penetration TestingTesting of iOS and Android applications against OWASP MASVS and MASTG to find weaknesses in storage, communication, and platform interaction, performed under written authorization.