Manual, evidence-driven testing of the applications your customers rely on.
Web application penetration testing puts a skilled, authorized attacker in front of your application before a real attacker finds it. Our senior penetration testers work by hand: testing inputs, edge cases, and breaking assumptions behind each workflow. Small weaknesses get chained into a demonstrated compromise, and every finding is written up in the report with the proof and a specific fix.
Login, registration, password reset and MFA flows: credential handling, brute-force resistance, and the recovery paths attackers can slip through.
Token generation and entropy, cookie flags, session fixation, concurrent sessions, and expiry and logout behaviour across devices.
Horizontal and vertical privilege escalation, insecure direct object references, and the role boundaries between customers, staff and administrators.
Race conditions, negative values, skipped steps and order-of-operations flaws in the workflows that move money or approve requests.
SQL injection, cross-site scripting, command injection, template injection and file upload abuse, all tested manually.
The REST and GraphQL endpoints your browser and mobile app rely on, tested for broken object-level authorization and excessive data exposure among other flaws.
Testing follows the OWASP Web Security Testing Guide (WSTG), and the engagement structure (scoping, testing, reporting, retest) follows PTES and NIST SP 800-115 and is documented on our penetration testing methodology page.
The public standards set the coverage baseline. On top of them sits our in-house testing methodology, built through our testers' collective years of experience and adapted to the target in front of us.
Every finding in a ClarenSec report is verified by hand and carries a proof of concept: the exact request, the parameter we changed, and the response that proves the impact, with sensitive values redacted. Alongside it sit reproduction steps your developers can follow in minutes, a CVSS v3.1 severity, and a specific fix. If we could not demonstrate an issue within the test window, the report will indicate that and explain why.
You receive an executive summary written for management and a technical report your engineers can remediate from. Once your fixes are complete, a retest of the fixed findings is part of the engagement, and the retest report states which issues are closed and which remain open.
It depends on the size and complexity of the application. A single application with a handful of user roles typically needs one to two weeks of testing plus reporting time; a large multi-tenant platform needs more. We confirm the timeline after a short scoping walkthrough of the application.
A staging environment that mirrors production is the safest choice. Where only production exists, we test it with guardrails: dedicated test accounts, non-destructive payloads, agreed testing windows, and an emergency contact on both sides.
The application URLs in scope, test accounts for each user role (ideally two per role), a technical contact who is reachable during the testing window, and written authorization to test. If the application sits behind a WAF or an allowlist, we agree in advance if our addresses will be whitelisted.
A scan runs automated checks and lists possible issues, many of them being false positives. A penetration test is manual: a tester chains weaknesses together and proves the impact with a proof of concept. Access control and business logic flaws, where the real risk in a web application usually sits, only show up under manual testing.
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