CREST-certified testing for customer portals, SaaS platforms, booking systems and authenticated web applications used by UK SMEs.
If customers, staff or partners can log in to your website, it is a business system rather than a brochure site. Web application penetration testing checks whether that system protects accounts, data, workflows and sensitive functions properly.
SME Cyber Solutions tests web applications for UK SMEs that need assurance before launch, after a major release, during annual review, or when a client, insurer or investor asks for independent evidence.
Authenticated areas. We test login flows, session handling, password reset journeys, account separation and access to sensitive functions.
Application workflows. We review booking, checkout, approval, document upload and admin journeys for ways they can be bypassed or abused.
Data handling. We check whether personal data, documents, records or tenant data can be exposed through predictable URLs, weak permissions or insecure responses.
Broken access control. Users may be able to view or change records that should belong to another account, role or organisation.
Injection and input flaws. Unsafe handling of form input, files or parameters can expose data or allow unintended commands.
Business logic abuse. Valid features can sometimes be combined in ways that bypass payment, approval, rate limit or permission controls.
Web application testing is useful for SMEs with customer portals, SaaS products, booking systems, document areas, online account management, payment-related journeys or bespoke web tools.
A typical scope includes the target application URLs, user roles, test accounts, agreed test windows, excluded destructive actions and any staging or production constraints. Where possible, testing is carried out against a stable staging environment with production-like data controls.
You receive a clear report with an executive summary, technical findings, evidence, affected assets, risk ratings and recommended remediation. We prioritise the issues that could cause real business harm and explain them in a way that owners, technical teams and external stakeholders can act on.
After remediation, we can re-test agreed findings and provide updated documentation confirming whether the vulnerabilities have been resolved.
What is web application penetration testing?
It is a controlled security assessment of a website, portal, SaaS product or online system, focused on how the application handles users, data, permissions, input and workflows.
Do you test against the OWASP Top 10?
Yes. OWASP Top 10 coverage is included, alongside business logic, role boundaries, workflow abuse and the ways your specific application could be misused.
Can you test a production application?
Yes, where appropriate. We agree timing, rules of engagement and safe testing boundaries before work starts so disruption risk is managed.
Many web applications also expose API endpoints. If your portal, mobile app or SaaS platform depends on backend endpoints, pair this with API penetration testing.
This service is part of our wider penetration testing for UK SMEs. If you are unsure what to test first, book a scoping call and we will help define a practical, fixed-scope engagement.
Tell us what systems you rely on and we will recommend a practical penetration testing scope.