Web application penetration testing, and every app in between.
Modern apps are sprawling attack surfaces: web front ends, mobile clients, and the APIs behind them. SubRosa tests all of them for the business-logic abuse and access-control flaws scanners miss, focused on exploitable risk and real business impact.
Web · Mobile · API · Source code · OWASP Top 10
What is web application penetration testing?
Web application penetration testing is a hands-on security assessment of an application, its front end, APIs, authentication, and business logic, to find the vulnerabilities an attacker could exploit: broken access control, injection, authentication bypass, and logic abuse like account takeover. Unlike an automated scan, it tests the flows and edge cases a real attacker would, across roles and states, and proves what data or actions they could actually reach.
Web, mobile, and the APIs behind them.
Specialized testing across every application type and layer in your environment.
Web application testing
Full OWASP Top 10 coverage plus authentication, session, and business-logic testing: account takeover, privilege escalation, and data exposure across roles and states.
API security testing
REST and GraphQL APIs tested against the OWASP API Top 10: broken object and function-level authorization, mass assignment, and over-permissive data exposure.
Mobile application testing
iOS and Android assessment covering API traffic, local data storage, and reverse engineering of the compiled app.
Source code review
Manual and automated review of your source to catch vulnerabilities, insecure patterns, and architectural issues before they ship.
Beyond the scanner, into the logic.
Business-logic focus
Automated tools miss logic abuse. We test the flows attackers exploit, account takeover, authorization bypass, and state manipulation, that no scanner can find.
Full-stack coverage
We test across UI, API, and backend layers, chaining conditions to show how a low-severity gap becomes a full compromise.
Developer-ready findings
Every finding comes with reproduction steps, affected code paths, and clear remediation guidance your engineers can act on immediately.
From finding to fix.
Your application testing findings live in Sable, prioritized, assigned to owners, and tracked from open to retested, so remediation stays on the rails and nothing slips.
- CriticalOpenBroken object-level auth (BOLA)API
- HighIn progressAccount takeover via reset flowWeb
- HighRetestedMass assignment on user objectAPI
- MediumOpenSecrets in local storageMobile
Common questions
- What is web application penetration testing?
- Web application penetration testing is a hands-on security assessment of an application, its front end, APIs, authentication, and business logic, to find the vulnerabilities an attacker could exploit: broken access control, injection, authentication bypass, and logic abuse like account takeover. Unlike an automated scan, it tests the flows and edge cases a real attacker would, across roles and states, and proves what data or actions they could actually reach.
- Do you test APIs and mobile apps as well as web applications?
- Yes. SubRosa tests web applications, REST and GraphQL APIs (against the OWASP API Top 10), and iOS and Android mobile apps, plus source code review and thick-client testing. Most modern applications share logic across all of these, so we test them together to catch flaws that only appear when the layers interact.
- How is application penetration testing different from a vulnerability scan?
- A vulnerability scan is automated and finds known, signature-based issues. Application penetration testing is performed by security engineers who test business logic, authorization, and chained conditions that scanners cannot understand, such as account takeover, privilege escalation, and IDOR/BOLA, and prove real, exploitable impact rather than a list of potential issues.
Secure your apps before attackers test them.
Book a web application penetration test and find the business-logic and access-control flaws that scanners never will.