Web Application VAPT

Web application penetration testing beyond the scanner.

Your web application is where customers log in, pay and hand you their data. We go in authenticated, across every role, and chain small weaknesses into account takeover and data exposure. Manual testing mapped to OWASP Top 10 and ASVS, a report your developers can fix from, and a retest to prove they did.

We test the application, not just the URL.

Automated tools are good at the surface and blind to intent. Our web application penetration testing services start where they stop. Testers holding OSCP and eWPTX work through OWASP Top 10 and ASVS controls by hand, then move into territory no checklist covers. A refund that can be replayed. A tenant boundary that leaks under the right request. A password reset that trusts the wrong parameter. Each finding is pushed as far as it realistically goes and demonstrated with a working proof of concept, not a scanner signature.

Modern applications are rarely one thing. A React or Angular front end talks to REST or GraphQL APIs, hands login to an identity provider and pulls in third-party scripts. We treat it as one system: an API and web app pentest covering the SPA, the services behind it and every role from anonymous visitor to super-admin. Multi-tenant platforms add tenant isolation to that list, because the most expensive bug in SaaS is another customer's data.

Every engagement runs remotely, with the lead tester a message away from kick-off to retest. For banks and fintechs in Pakistan, where State Bank of Pakistan technology governance and cybersecurity guidance sets the expectation, a current web application pentest report is usually the first thing an auditor asks to see. For SaaS companies and software exporters, it is often the last item on an enterprise buyer's checklist before signature. One engagement, one report, written for the engineer fixing the bug and the auditor reading the summary.

What we test in your web application.

Authenticated & Role-Based Testing

Most real damage happens after login. We test every role you provide and check that each one is fenced in as tightly as the design claims.

  • Horizontal & vertical privilege escalation
  • Multi-tenant data isolation checks
  • Role matrix mapped against every endpoint

Business Logic & Workflow Abuse

Checkout, onboarding, approvals, refunds, referrals. We walk each flow out of order, skip steps, replay requests and bend limits to see what the application lets slide.

  • Payment, pricing & discount manipulation
  • Race conditions & request replay
  • Step-skipping in multi-stage flows

Authentication, Session & Access Control

Login, MFA, password reset, SSO and token handling get the closest scrutiny, because one weak link here is a full account takeover.

  • MFA & password-reset bypass
  • JWT, OAuth & SSO misconfiguration
  • IDOR & broken object-level authorisation

Injection & Server-Side Flaws

SQL, NoSQL, command and template injection, SSRF into internal services and cloud metadata, insecure deserialisation and file-handling bugs. Found by hand, confirmed with a working exploit.

  • SQL, NoSQL, template & command injection
  • SSRF to internal services & metadata
  • Deserialisation & unsafe file upload

Backend API Testing

Modern SPAs are thin shells over REST and GraphQL. We intercept every call the front end makes, plus the ones it never does, and test the API on its own terms.

  • OWASP API Security Top 10 coverage
  • GraphQL introspection, batching & depth abuse
  • Hidden, legacy & undocumented endpoints

Client-Side & Framework Issues

React, Angular, Vue and Next.js change where bugs live. We look at DOM XSS, postMessage handling, CSP gaps, prototype pollution and third-party scripts running in your origin.

  • DOM-based XSS & CSP bypass
  • postMessage & CORS misconfiguration
  • Prototype pollution & dependency risk

Retest & Remediation Validation

Fixes are retested against the original proof of concept, not a checkbox. One retest of reported findings is included in a standard engagement, and results slot into your sprint or CI cadence.

  • Per-finding verification with fresh evidence
  • Delta report: fixed, partial, still open
  • Attestation letter on a clean retest

Compliance-Ready Reporting

Findings are mapped to the evidence PCI DSS, ISO 27001 and SOC 2 assessors expect from a penetration test, so the report goes straight into the audit file instead of being rewritten for it.

  • PCI DSS penetration-testing requirement support
  • ISO 27001 & SOC 2 evidence-ready format
  • CVSS score & CWE reference per finding

How an engagement runs.

  1. / 01

    Scoping the Application

    We map the application with you: user roles, tenants, integrations, third-party components and what is in or out. Everything is under NDA from the first call, and Rules of Engagement, test accounts and a testing window are agreed before anyone sends a request.

  2. / 02

    Enumeration & Role Mapping

    Every route, parameter, API call and hidden feature is catalogued, including the ones the front end never exposes, and cross-referenced against the role matrix. This becomes the surface we work through methodically, so nothing is tested by accident and nothing is missed out of habit.

  3. / 03

    Manual Exploitation

    The bulk of the engagement. Testers work through authentication, access control, business logic, injection and client-side classes across each role, chaining findings to show real impact. If we confirm a critical, you hear about it the moment it is confirmed, over a secure channel, not when the report lands.

  4. / 04

    Report & Developer Debrief

    Leadership gets a plain-language executive summary; engineers get reproducible steps, evidence and prioritised fixes for every finding. Then a private call with your developers to go through each issue and take the awkward questions.

  5. / 05

    Retest & Delta Report

    Once fixes ship, we re-run every reported finding against its original proof of concept and report each one as fixed, partially fixed or still open. A clean retest earns an attestation letter for your customers' vendor-security reviews and your auditors.

Why teams choose Zencryptix.

  1. / 01

    Bug-bounty roots

    Our founders came up through vulnerability disclosure programmes; 58 companies, Reddit, Expedia and Atlassian among them, have publicly acknowledged their reports. Your application gets the same curiosity that found those bugs.

  2. / 02

    Findings you can reproduce

    Every issue comes with the exact request, response and steps to trigger it. Your developers fix the bug, not a sentence describing it, and the retest is measured against the same evidence.

  3. / 03

    Reports built for vendor-security reviews

    Written so a software house can hand it straight to an enterprise buyer in the US or EU, and a bank can file it for an SBP-facing review. Same evidence, same format, two audiences.

Common questions.

Most single applications take two to four weeks from kick-off to final report. Large multi-tenant SaaS platforms can run to six. Effort, and therefore cost, is driven by the number of roles, workflows and API endpoints rather than a flat rate, which is why we scope first and quote within 48 hours of scoping.
It helps, but it is not mandatory. Staging lets us test aggressively, including payment and deletion flows, without touching live customers. If production is the only option, we agree a testing window and Rules of Engagement that exclude destructive actions and set clear stop conditions.
Ideally two accounts per role so we can test cross-user access, plus one per tenant in multi-tenant systems. Grey-box testing with credentials finds far more than an unauthenticated scan. For a white-box engagement, read access to source code or architecture diagrams speeds things up further.
It should not. We throttle traffic, avoid denial-of-service techniques unless you specifically ask for them, and coordinate with your team before anything that could change data. You have a direct line to the lead tester throughout, and we stop immediately on request.
Yes. One retest of reported findings is included in a standard engagement, scheduled once your team confirms fixes are deployed. You receive a delta report showing what is fixed, partially fixed or still open, and on a clean retest an attestation letter.
The report is structured around the penetration-testing evidence auditors ask for under PCI DSS, ISO 27001 and SOC 2. It also aligns with the VAPT expectations of regulators such as the State Bank of Pakistan. Compliance decisions rest with your auditor, but we build the report around what they look for and will join a call if they have questions.

Ready to test your web application?

Send us the URL, the number of user roles and a rough endpoint count. Expect a reply within 24 hours and a detailed quote within 48 hours of scoping.

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