Web Application Penetration Testing
We manually test your web application the way a real attacker would — beyond the OWASP Top 10 into the business logic that scanners never understand. Every finding ships with a working proof of concept and a fix your team can act on.
What is Web Application Penetration Testing?
Your web application is the front door to your data, and it changes with every release. We test it the way a determined attacker would: mapping every input, role and workflow, then manually chaining weaknesses into real compromise instead of stopping at a scanner's first alert. The result is a short, ranked list of what actually puts your business at risk — with proof.
Most damaging web bugs aren't in the OWASP Top 10 category list at all — they live in your specific business logic: a checkout that trusts a client-side price, an invitation flow that skips a check, a role that can do one thing too many. Automated tools have no concept of what your application is supposed to do, so they walk straight past these. We start by learning how your app works, then we abuse that understanding the way a motivated attacker would.
A common misconception is that a green scanner report means an application is secure. In practice scanners see roughly the surface — reflected inputs, known signatures — while the breaches that make headlines come from authorization logic, chained low-severity issues and abuse of intended functionality. That gap is exactly what a manual web application penetration test is designed to close, and why we lead with human testers rather than tooling.
Web Application Penetration Testing is a manual, exploit-driven assessment: real people attacking your target the way an adversary would, then proving each finding with a working proof of concept. It is not an automated scan with a logo on it — the point is to find and demonstrate the issues that actually put you at risk, and hand your team a clear plan to fix them.
Why it matters
Applications are the most-attacked surface on the internet, and a single exploitable flaw can expose your entire customer base. Scanners catch the obvious; the damaging bugs live in logic and authorization, where only manual testing reaches them.
A web application penetration testing engagement replaces guesswork with evidence. Instead of hoping your controls hold, you get a ranked, reproducible picture of where they don’t — before someone hostile finds the same gaps.
Industries & use cases
Web application testing matters most for SaaS platforms, fintech and payment flows, healthcare portals handling patient data, and any e-commerce or customer portal where a single access-control flaw exposes every user. We regularly test customer-facing apps, internal admin tools and partner portals — the places where one bug affects your whole user base.
What we test
Manual, exploit-driven coverage focused on real impact — not scanner noise.
- Broken access control and IDOR
- Authentication and session flaws
- Injection (SQL, NoSQL, command, SSTI)
- SSRF and cloud metadata access
- Business-logic and workflow abuse
- File upload and deserialization issues
Signs you should run a web application penetration testing
If any of these apply, testing is overdue.
- You handle customer data, payments or accounts and haven't tested in the last year
- You've shipped major features, a redesign or a new API since your last test
- A customer, auditor or cyber-insurer is asking for a penetration test report
- You rely on scanners and want to know what they're missing
- You're preparing for SOC 2, ISO 27001 or PCI DSS
Common vulnerabilities we find
The issues that show up again and again in web application penetration testing — and the ones that actually get exploited.
Broken access control
A low-privilege user reaches admin functions or other users' records by tampering with IDs, parameters or forced browsing.
Server-side request forgery (SSRF)
The app fetches an attacker-supplied URL, exposing cloud metadata, internal services and credentials.
Injection & template abuse
Unsanitised input reaches a database, OS command or template engine, leading to data theft or remote code execution.
Insecure deserialization
Untrusted serialized data is deserialized by the server, leading to remote code execution or object injection.
Sensitive data exposure
Debug endpoints, verbose errors or misconfigured storage leak tokens, PII or internal detail an attacker can weaponise.
Cross-site scripting (XSS)
Reflected, stored or DOM-based script injection leading to session theft or account takeover.
Cross-site request forgery (CSRF)
State-changing actions performed on behalf of an authenticated victim without their intent.
Security misconfiguration
Default credentials, exposed admin interfaces, verbose errors and missing hardening.
Example attack chain
Real impact rarely comes from one bug — it comes from chaining several. A representative example:
Why choose webhook.press
Attacker mindset
We’re offensive security people who also build the free tools bug-bounty hunters use daily. We test the way real adversaries do — and prove it.
No scanner theatre
You get findings a human exploited and verified, ranked by real business risk — not an unfiltered tool dump padded to look thorough.
Fixed price, free retest
A clear quote after scoping, a report your team and auditors can use, and a free retest to confirm the fixes hold.
Our methodology
A structured, transparent process aligned to OWASP and PTES — with a named point of contact throughout.
Scoping & rules of engagement
We agree the exact targets, depth, timing and constraints for your web application penetration testing, and set clear rules of engagement so testing is safe and predictable.
Reconnaissance & mapping
We enumerate the full attack surface — endpoints, roles, technologies and trust boundaries — and threat-model where an attacker would focus.
Manual testing & exploitation
We attack by hand, verifying and chaining weaknesses into real impact. Automated tooling supports coverage; humans find the logic and authorization bugs it can’t.
Analysis & risk rating
Each finding is validated, rated by real business risk rather than raw scanner severity, and de-duplicated so you get signal, not noise.
Reporting
You receive an executive summary for leadership and a technical section with reproducible PoCs, evidence and concrete, stack-specific remediation.
Free retest
After you remediate, we re-test the closed findings to confirm they are actually fixed — at no extra cost.
What you get
Reproducible PoCs
Every finding ships with a working proof and step-by-step reproduction your engineers can replay and verify.
Risk-ranked findings
Prioritised by real business impact, so you fix what matters first instead of drowning in low-severity noise.
Actionable remediation
Concrete, stack-specific fixes and guidance — not generic “apply best practice” filler.
Free retest
We re-check the closed findings after remediation and confirm they’re resolved.
The report is written for two audiences at once: an executive summary that a non-technical stakeholder can act on, and a detailed technical section — findings, evidence, CVSS and reproduction — that your developers and auditors can use directly.
Manual testing, not just a scan
Automated scanners are fast and useful for coverage, but they only find patterns they already know, and they flood you with false positives. They cannot understand your business logic, chain several small issues into a breach, or tell you which alert actually matters. Our web application penetration testing is led by experienced testers who exploit findings by hand and rank them by the damage they’d really do — the difference between a 300-page tool dump and a short list of things worth fixing.
Standards & compliance
Our web application penetration testing reports are written to support the frameworks your auditors and customers care about — including SOC 2, ISO 27001, PCI DSS, HIPAA, GDPR, and the EU’s NIS2 and DORA. Each engagement produces clear, independent evidence of testing with scope, methodology and findings documented the way assessors expect, so the same test both hardens your systems and helps satisfy your obligations.
Frameworks we follow
Recognised methodologies, adapted to your target — never a rigid checklist.
- OWASP — Web Security Testing Guide, ASVS and the API Security Top 10
- PTES — the Penetration Testing Execution Standard
- NIST SP 800-115 — technical guide to security testing
- OSSTMM — Open Source Security Testing Methodology Manual
- MITRE ATT&CK — to frame real-world adversary techniques
FAQ
Do you test business logic, not just OWASP?
Yes. Automated tools miss logic flaws entirely. We map your workflows and abuse them — price manipulation, privilege escalation, race conditions and more.
Black-box or white-box?
Either. Grey-box (some access) usually gives the best coverage per day, but we adapt to your goals and constraints.
Do you test authenticated and unauthenticated areas?
Both. We test what an anonymous attacker sees and, with test credentials, what each role can reach — including whether one role can escalate to another.
Will testing affect our production data?
We agree rules of engagement first and test carefully. Where destructive checks are needed we use staging with production-like data, on your sign-off.
Do you provide a letter of attestation?
Yes — a summary letter you can share with customers and auditors, alongside the full technical report.
Can you test behind a login and complex workflows?
Yes — we handle multi-step flows, MFA and role-based access using the test accounts you provide.
How long does a web application penetration testing take?
Most focused engagements run one to two weeks depending on scope; we agree the exact timeline during scoping.
Is a retest included?
Yes — after you remediate, we re-check the closed findings to confirm they’re fixed, at no extra cost.
How do you price it?
Per engagement, based on scope and depth — you get a fixed quote after a short scoping call. No cookie-cutter packages.
Why teams trust our web application penetration testing
Aligned to recognised standards
Testing follows OWASP, PTES, NIST SP 800-115 and MITRE ATT&CK, and reports support SOC 2, ISO 27001, PCI DSS, HIPAA, GDPR, NIS2 and DORA.
Every engagement includes
Reproducible PoCs, risk-ranked findings, concrete remediation, a named point of contact, a free retest, and a summary letter of attestation.
Confidential by default
Work is covered by an NDA, scoped with clear rules of engagement, and data is handled with care throughout — including residency requirements.
Sample report available on request — see our reporting format and depth before you commit. Ask for a sample →
Get a quote for Web Application Penetration Testing
Tell us about the target — we’ll come back with scope and a fixed price. Manual, exploit-driven testing with reproducible proof and a free retest.