Unauthenticated
Simulates an external attacker with no account.
Shows what anyone on the internet can reach.
4.9on G2
Web Application Penetration Testing Services
Protect sensitive data and your customers' trust by finding the web app vulnerabilities attackers target first, including the business logic flaws scanners miss.
We were very happy with the results and believe GRSee did a very thorough job with the penetration test.Marc Rubbinaccio, Head of Cybersecurity and Compliance, Secureframe
Deep, logic-level testing that scanners cannot do.
We go beyond automated scans to find the high-impact issues that traditional tools and other vendors miss: broken access control between users and tenants, workflows that can be abused, and low findings that chain into something serious.
Strategic automation finds the common weaknesses quickly; manual deep-dive testing, following the OWASP testing guide, does the rest. Every test is tailored to your application and how it is actually used.
Penetration testing, done properly.
- Expert ethical hackersExperienced security professionals with deep expertise in offensive security.
- Advanced hybrid testingStrategic automation for common issues, manual deep-dive testing for the hard-to-find ones.
- Tailored to your environmentEvery test is customized, so results are accurate and relevant.
- Actionable insightsA report with prioritized remediation steps your engineers can act on.
- Fast turnaroundComprehensive results without long waits, so you can act quickly.
- Testers you can talk toKickoff, status updates and a post-assessment review, with testers on hand to clarify findings.
- Results on our platformTrack status, manage remediation and see analytics on findings in one place.
- Fixed scope, fixed priceOne clear quote upfront. No change orders mid-test.
How a web application pentest runs.
Scope, test, report, retest: agreed with your team before we start.
Scope
- Scope and attack surface mappingWe map the application: every role, entry point, workflow, integration and technology, so nothing in scope goes untested.
- Discovery and reconnaissanceManual research plus automated crawling to see the app the way an attacker would before the first request.
Test
- Automated and manual testingAutomated scanning for common vulnerabilities, then manual testing of authentication, access control, sessions and business logic.
- Exploitation and attack simulationWe exploit what we find, safely, to prove real impact: account takeover, data access across tenants, privilege escalation.
- Post-exploitation and risk analysisWe assess how far an attacker could go from each foothold, so findings are ranked by real business risk.
Report
- Reporting and remediation guidanceFindings ranked by risk, with clear, prioritized remediation steps your engineers can act on.
Fix and keep going
- RetestingOnce fixes are in, we retest to confirm each finding is closed.
- PT as a ServiceFor ongoing protection, continuous penetration testing through our PTaaS program.
Authenticated or unauthenticated testing?
Authenticated
Tests what a logged-in user, or a malicious insider, can access.
Where access-control and business logic flaws live.
We typically do both when applicable, for a complete view of your security posture.
What web application penetration testing does for your business.
- Protect customer dataFind the flaws that expose user and tenant data before attackers do.
- Pass customer security reviewsGive enterprise buyers and procurement teams a report they trust.
- Catch business logic flawsThe issues automated scanners miss, found by testers who understand your workflows.
- Meet compliance requirementsSatisfy pentest requirements for PCI DSS, SOC 2, ISO 27001 and more.
- Gain executive buy-inConcrete, demonstrated risk to justify security investment.
Why teams choose GRSee for web application penetration testing.
A high-touch pentest partnership that scaled with the security program.
Read the story- Beyond the basicsHigh-impact and business logic vulnerabilities, not just a scanner's list.
- Proven methodologiesOWASP's full testing guide, OSCP methodologies, The Web Application Hacker's Handbook and the SANS Top 25.
- Inside and outside the loginWe test as an anonymous attacker and as your logged-in users, so access-control gaps between roles and tenants surface.
Related services
We felt there’s an owner to the project, who knows from start to finish what to do and how to do it in the most efficient way.Kobi Kochavi, Senior Information Security Manager, Forter
Web app pentest guides from our team.
- Application Penetration Testing: Types and Essential StepsShay Aberbach, Aug 12, 2025Read the guide
- Penetration Testing Steps From Pre-Engagement to ReportingTom Rozen, Aug 8, 2025Read the guide
- Types of Penetration Testing and Their Applications in CybersecurityTom Rozen, Aug 7, 2025Read the guide
Web app pentest questions, answered.
Still not sure? Bring your questions to a scoping call.
What vulnerabilities do you look for in a web application test?
Broken authentication, insecure access controls, injection flaws, cross-site scripting (XSS), insecure APIs, session management weaknesses, business logic flaws and sensitive data exposure, combining automated tools with manual validation.
Do you test the APIs and third-party integrations behind our web app?
Yes. We assess APIs, payment gateways, cloud services and other integrations for authentication weaknesses, insecure data handling, excessive permissions and integration gaps.
Can a web app pentest help with client security reviews?
Absolutely. Many organizations test to meet customer requirements, vendor assessments and procurement reviews. A professional pentest shows you actively evaluate and improve application security.
Do you perform authenticated and unauthenticated testing?
Yes, typically both. Unauthenticated testing simulates external attackers; authenticated testing shows what a logged-in user or malicious insider could reach.
How long does a web application pentest take?
Typically 2 to 6 weeks, depending on the number of assets, their size and complexity.
How often should penetration tests be conducted?
At least annually, and after major system updates, infrastructure changes or security incidents. High-risk industries may need more frequent testing.
Will testing disrupt our operations?
Testing is planned to minimize disruption. We coordinate timing, use controlled methods, and can test staging or development environments instead of production if you prefer.
Do you retest after we fix the findings?
Yes. We retest to verify that vulnerabilities have been properly remediated before findings are closed.
Book your scoping call.
Pick a time that suits you. You leave with a scope and a fixed quote.
- Testers you can talk to
- A retest after you fix
- Results on our platform
Local teams, your time zone
- United States
- Europe
- Middle East
We work in your time zone and support you in multiple languages.
When FICO needed security services, I immediately turned to them. Their expertise, efficiency, and thoroughness continue to impress.Hilik Kotler, CISO, FICO
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