Secure Code Review

Secure code review that finds what tools miss

From logic to intent—security validation at the source

A secure code review is the systematic, security-focused examination of an application’s source code to identify exploitable security flaws before they reach production. Defined by the Open Web Application Security Project (OWASP) Code Review Guide, it is distinct from penetration testing, which tests a running application from the outside. Static application security testing (SAST) tools flag potential issues automatically. A manual code review then confirms which flags represent vulnerabilities that automated tools cannot assess without context, and can uncover logic, access control, and trust-boundary flaws that static analysis often misses. Swarmnetics conducts secure code reviews through Offensive Security Certified Professional (OSCP) and CREST Registered Penetration Tester (CRT) certified consultants.

When unreviewed code becomes the attacker’s entry point

Because every missed bug is a breach waiting to happen

In February 2024, threat intelligence firm Group-IB reported that a criminal group called ResumeLooters had compromised 65 job search and retail websites across the Asia-Pacific region, stealing more than two million personal records. The attackers exploited SQL injection and cross-site scripting vulnerabilities in the targeted websites’ application code using publicly available tools. A secure code review would have identified the SQL injection and cross-site scripting vulnerabilities in the targeted websites’ input handling before they were exploited.

For organisations building or customising software, application security has to be addressed within the software development lifecycle. A secure code review gives your development team documented evidence of security testing for regulators and auditors. It also helps reduce the risk of a breach caused by vulnerabilities present in the code at release. This applies across every organisation that builds or customises software.

How manual review cuts through SAST noise

Embedding defense at the source—every commit, every build

Swarmnetics’ secure code review is manual-first, with tool support used to improve coverage and efficiency. Our consultants use Black Duck Coverity to surface candidate issues at scale, then manually validate exploitability, trace execution paths. Swarmnetics’ secure code review combines automated scanning with manual expert analysis to confirm which SAST findings are genuinely exploitable, distinguishing real risk from tool noise.

Manually reviewing code quality and security issues reveals what automated scanning cannot reach. Our consultants use code forward and backward tracing to investigate logic errors, access control failures, and complex security misconfigurations that only become clear when the surrounding application context is understood. That includes tracing external inputs to dangerous sinks, following authentication and authorisation checks into protected functions, and reviewing how data moves across trust boundaries. Authentication flows, encryption implementation, and administrative modules receive close attention because that is where subtle flaws often sit. Identifying vulnerabilities here means tracing the software development lifecycle to expose security vulnerabilities that tools cannot surface in real time.

For application security assessments that include open source dependencies, an optional dependency check extends coverage to vulnerable third-party components. Our consultants verify and rate each finding in the code review process against Common Vulnerability Scoring System (CVSS) severity, with developer-level remediation guidance tied to the affected code path and the reason the issue is exploitable.

Yes, we are CREST accredited

Our core team is based in Singapore and consists of CREST certified penetration testers who are also Offensive Security Certified Professional (OSCP) certified. The team has delivered numerous penetration testing projects for customers in Singapore and other locations, from large multinational enterprises to small and medium business, and across various industries.

Learn more

Inside the code paths that matter

Building security into the DNA of your code

A secure code review examines the following scope items, vulnerability types, and attack vectors across all languages and frameworks used by your development teams:

Authentication and authorisation implementation — including session management, privilege escalation paths, and broken access control
Input validation and output encoding — covering SQL injection, XSS, OS command injection, and XML/JSON injection
Encryption implementation — key handling, modes of operation, and misuse of cryptographic libraries
Internal data handling — database interaction, application server communication, and file system access
Business logic vulnerabilities — flaws specific to your application’s intended behaviour that scanners cannot model
Administrative module security — backdoors, undocumented functions, and developer-inserted test code
Known language-specific vulnerabilities — platform and framework weaknesses relevant to your technology stack
Third-party and open-source dependency risks — optionally scanned using OWASP Dependency-Check and Google OSV Scanner

FAQ

A secure code review examines your application’s source code directly, before the application is deployed. A web application penetration test assesses the running application from the outside, simulating an attacker without access to the code. Used together, they cover both ends of the lifecycle: a secure code review finds flaws at the point they are introduced; penetration testing confirms whether those flaws are exploitable in production.

Swarmnetics examines authentication and authorisation controls, input validation logic, encryption implementation, internal data handling, administrative modules, and business logic specific to your application. We target common vulnerability classes including SQL injection, cross-site scripting, insecure direct object references, and hardcoded credentials. For applications using third-party libraries, an optional dependency check identifies vulnerable or outdated components across your software supply chain.

Swarmnetics conducts every secure code review as a white-box engagement, requiring access to the application’s source code, design documentation, and data flow diagrams. Read-only repository access or a secure file transfer is sufficient.

Unresolved code-level vulnerabilities allow attackers to exfiltrate customer databases through SQL injection, hijack user sessions through cross-site scripting, bypass authentication through logic flaws, or install backdoors through malicious code inserted during development.

A secure code review from Swarmnetics produces a draft report for your review, followed by a final report upon acceptance. Every finding is referenced against CWE identifiers and the OWASP Top 10 vulnerability classification with a severity rating and specific remediation guidance — including the precise code-level change or design remediation required. An executive summary is included for non-technical stakeholders. After you have addressed the findings, Swarmnetics conducts a follow-up review to confirm adequate remediation.

A secure code review is relevant to any organisation that develops custom applications or integrates third-party libraries or frameworks into their applications. It is particularly important for organisations subject to regulatory, contractual, or industry security requirements, which requires security to be addressed within the software development lifecycle. Swarmnetics recommends conducting a secure code review before major releases, after significant code changes, and as a routine part of a secure SDLC programme.

The duration of a secure code review depends on the size of the codebase, the number of languages, and the complexity of the application logic. A typical secure code review engagement takes five to ten business days, followed by an initial report within five business days for your review.

A secure code review is often required for compliance with applicable regulatory, contractual, or industry security obligations where organisations must address security within the software development lifecycle. It provides documented evidence of application-level security testing within the SDLC that regulators and auditors may request.

Every secure code review follows a three-phase process. In the planning phase, Swarmnetics agrees the scope and schedule with your team. In the assessment phase, our consultants perform a combination of automated static analysis and manual expert review guided by OWASP standards to identify security weaknesses. In the reporting phase, we deliver a draft report for review and a final report with specific remediation guidance for every finding.

All Swarmnetics code analysis engagements are conducted by our Singapore-based team of security consultants holding the Offensive Security Certified Professional (OSCP) and CREST Registered Penetration Tester (CRT) credentials. Swarmnetics has been delivering technical security assessments to organisations across Singapore since 2015 and serves as a trusted VAPT partner for leading enterprises across technology, telecommunications, and professional services.

The security assessment report includes specific, actionable remediation guidance for every finding — not generic advice. For each vulnerability, we describe the fix, its priority based on CVSS severity, and any dependencies between remediation steps. Once your team has addressed the findings, Swarmnetics conducts a follow-up retest to verify that each vulnerability has been adequately remediated. The final report confirms closure and provides documented evidence of remediation.