Offensive Security

Application Security Assessment

Deep security testing of your web, mobile, and API applications aligned to OWASP. Manual-led findings with root-cause explanation and developer-ready remediation.

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Overview

Applications are where your business logic, sensitive data, and user trust concentrate, which makes them a primary target for any attacker. An application security assessment goes deeper than a generic network test, examining authentication, authorisation, session management, input handling, business logic, and data protection specific to your application. A thorough assessment improves your security posture in the places that matter most: the code your users interact with every day.

We align application security testing to the OWASP testing guides for web applications, mobile applications, and APIs, combining tooling with manual testing to find the security issues automated scanners routinely miss: broken access control, broken object level authorization, and business-logic abuse that only a human tester will spot by understanding what the application is supposed to do. We also look for security vulnerabilities introduced by third-party dependencies and application code that handles data protection incorrectly. Our cybersecurity approach to application testing incorporates real-world attack scenarios so that the findings reflect what an attacker would actually attempt, not just what a scan can flag.

Findings come with reproduction steps your developers can follow, a root-cause explanation, and developer-ready remediation guidance. An attacker does not stop at documentation. We re-test within an agreed window to confirm the fixes hold. We also offer application security controls review for teams who want to identify vulnerabilities early in the development cycle.

What’s included

Web application, mobile (iOS and Android), and API security testing
Testing aligned to OWASP Top 10 and the relevant OWASP testing guides
Authentication, authorisation, and session management testing
Business-logic and access controls abuse testing
Input validation, injection, and cryptographic failures testing
Reproduction steps and developer-ready remediation
Remediation re-test within an agreed window

How we work

01
Scope and map
We map the application, its roles, its sensitive functions, and its trust boundaries, and agree the testing approach and depth. We confirm the scope of the assessment and any areas out of bounds before testing begins.
02
Test
We combine manual testing with tooling across the OWASP methodology, capturing reproduction evidence for every finding. We test for security risks that real-world attackers prioritize, including injection flaws, broken access controls, and insecure dependencies.
03
Rate and explain
We rate findings by exploitability and impact, and explain the root cause so your developers understand why the fix matters, not just what to change. Critical vulnerabilities are flagged for immediate remediation.
04
Report and re-test
We deliver developer-ready remediation guidance and re-test fixes within the agreed window, then issue an updated attestation confirming which security issues have been resolved.

What you get

Application security assessment report with reproduction steps
Risk-rated findings mapped to OWASP categories
Developer-ready remediation guidance
Remediation re-test and updated attestation

Frequently asked questions

Do you test mobile apps and APIs as well as web applications?

Yes. We assess web applications, mobile applications on iOS and Android, and the APIs behind them, each aligned to the relevant OWASP testing guide. Web application security and API security testing are conducted as a combined scope where the two share a backend.

Can you work directly with our development team?

Yes. We brief your developers on findings, explain root causes in terms they can act on, and re-test fixes so the engagement improves the code rather than just documenting its state. We can also conduct a code review on critical application code where source code access is in scope.

Does this differ from a network penetration test?

Yes. A network penetration test focuses on infrastructure-level exposure: open ports, unpatched services, and network segmentation. An application security assessment focuses on the application layer: how the code handles authentication, access control, input, and business logic. Both are valuable; they test different things. An attacker who cannot breach the perimeter will often pivot to application vulnerabilities instead.

What security vulnerabilities does an application security assessment typically find?

Common findings include SQL injection and other injection flaws, broken access controls and privilege escalation paths, insecure session management, cross-site scripting, sensitive data exposure, insecure APIs, authentication weaknesses, and security issues in third-party dependencies. The OWASP Top 10 is a useful reference for the categories we test most frequently.

See the kind of report you get

Every engagement ends with a report you can act on: an executive summary, CVSS-aligned findings, reproduction evidence, and prioritised fixes. Ask for a redacted sample and we will share one.

Request a sample report