What is Source Code Review?
Your application behaves exactly as designed. The problem is that some of what was designed creates security risks nobody noticed at the time.
Source code review is a security-focused examination of your codebase — not running scans against a live application, but reading the actual code your team wrote, tracing how data flows through it, and finding the patterns that attackers exploit. iSecNet combines automated SAST scanning for breadth with manual expert analysis for depth, so nothing stays hidden behind a false negative or gets buried in scanner noise.
Key Benefits of Source Code Review
What Your Development Team and Business Gain From a Proper Code Review Security built into the codebase beats security bolted on after the fact — every time.
SAST and Manual Analysis Combined
Automated tools give you speed and coverage. Certified human analysts give you accuracy and depth. iSecNet delivers both — catching known vulnerability patterns at scale and the logic-level flaws that no scanner is built to understand.
Vulnerability Identification
Every finding maps to the exact file name and line number creating the risk. No vague recommendations — just specific, actionable findings your developers can resolve without interpretation.
Risk Mitigation
Vulnerabilities fixed in development cost a fraction of vulnerabilities fixed post-deployment — and a fraction again compared to post-breach remediation. A code review before release is the most cost-effective security investment in your entire development cycle.
Compliance Assistance
ISO 27001 Control 8.28, PCI-DSS Requirement 6.3, and SOC 2 CC8.1 all require evidence of secure code practices. Our reports are structured to satisfy all three — giving your compliance team audit-ready documentation without extra preparation work.
Custom Reports
Technical and Executive Developers get file-level findings with secure fix examples. Leadership gets a clear business-risk summary. Compliance teams get framework-mapped evidence. One report serves every stakeholder without translation.
Continuous Monitoring and Support
Security does not end at the report. iSecNet retests every remediated finding to confirm fixes are effective and offers ongoing support for teams building secure coding practices into their development process long-term.
Types of Code Review We Perform
Four Ways iSecNet Reviews Your Code Security No single review method catches everything. We combine all four to make sure nothing gets through.
Static Analysis
We run your entire codebase through advanced static analysis tooling — Semgrep, SonarQube, and custom rule sets — before a human analyst touches a single file. This phase catches known vulnerability patterns, insecure function calls, outdated dependency CVEs, and compliance violations at scale across every language and framework in your stack. Fast, broad, and the foundation everything else builds on.
Dynamic Analysis
Some vulnerabilities only surface when the application is actually running. Dynamic analysis tests your application under real execution conditions — identifying runtime security weaknesses, memory handling issues, race conditions, and session management flaws that static code inspection alone would never reach. Where static analysis reads the map, dynamic analysis drives the road.
Manual Code Review
This is where automated tooling stops and expert judgement begins. A certified iSecNet analyst reads your code as both a developer and an attacker — tracing authentication flows, following data through the application, evaluating business logic for exploitable conditions, and identifying multi-step vulnerabilities that no scanner is built to connect. Every finding in your final report that carries Critical or High severity comes from this phase.
Architecture Review
Some security problems cannot be fixed with a patch. When the fundamental design of an application creates risk — trust boundaries in the wrong place, components with excessive access, data flowing between services without validation — no amount of line-level hardening resolves it. iSecNet's architecture review examines your application at the structural level, identifying design-layer vulnerabilities before they become permanent features of your production system.
Common Code Vulnerabilities We Find
What We Find in Codebases That Have Never Been Security Reviewed These are not rare edge cases. They appear consistently across industries, languages, and team sizes.
SQL Injection
Still the most exploited vulnerability in web applications globally — and still appearing in production codebases every day. We trace every database interaction in your code, identifying direct string concatenation in queries, unsafe ORM usage, and stored procedure inputs that accept unsanitised data. One exploitable SQL injection path can give an attacker read, write, and delete access to your entire database.
Cross-Site Scripting
Unescaped user input rendered into HTML. Unsanitised values written directly into JavaScript. DOM manipulation that treats external data as trusted content. XSS vulnerabilities let attackers run malicious scripts inside your users' browsers — stealing session tokens, hijacking accounts, and redirecting users to phishing pages while your application appears completely normal.
Authentication Flaws
Broken authentication is ranked consistently in the OWASP Top 10 because it is found consistently in real applications. We identify session tokens with insufficient randomness, JWT implementations with weak or missing signature verification, password reset flows with predictable tokens, and authorisation checks that get bypassed under specific conditions your QA team never thought to test.
Input Validation
Every point where your application accepts external data without properly validating it is a potential entry point. We find missing or bypassable input checks that create path traversal vulnerabilities, buffer overflow conditions, server-side request forgery risks, and XML injection paths — often sitting quietly in features that have been in production for years without a single security test.
Cryptographic Issues
Weak cryptography is invisible to users and dangerous to businesses. We identify MD5 and SHA-1 used for password storage, hardcoded encryption keys and static IVs, predictable random number generation in security-sensitive contexts, disabled TLS certificate validation in HTTP client code, and JWT configurations that accept the none algorithm — each one a confirmed vulnerability with a clear fix.
Configuration Errors
Debug endpoints left active in production. Default credentials unchanged after deployment. Verbose error messages exposing full stack traces to end users. Dependency versions carrying known CVEs that automated updates never addressed. Configuration errors are not glamorous findings — but they are consistently present and consistently exploitable by attackers who know exactly where to look.
Our Review Process
How iSecNet Reviews Your Codebase — Six Phases, No Shortcuts Every engagement follows the same proven process — from secure code collection to verified remediation sign-off.
1. Code Collection
Your codebase is shared only after a signed NDA is in place. We collect the complete repository — application code, dependency manifests, configuration files, infrastructure-as-code, and environment setup — because security vulnerabilities rarely live in one place. Everything that contributes to how your application behaves gets included in the scope from day one.
2. Automated Scanning
Before a human analyst opens a single file, we run your codebase through advanced SAST tooling — Semgrep, SonarQube, and custom security rule sets built for your language and framework. This phase establishes full coverage across known vulnerability patterns, insecure dependency versions, and compliance violations at scale. It gives our analysts a prioritised starting point, not a final answer.
3. Manual Analysis
This is where the real work happens. A certified iSecNet security analyst reads your code as both a developer and an attacker — tracing authentication logic, following data flows, evaluating business rules for exploitable conditions, and connecting findings that automated tools flag individually but never chain together. Every Critical and High severity finding in your report originates here.
4. Risk Assessment
Not all vulnerabilities carry equal weight. We evaluate every finding against three criteria — severity of the flaw, how easily it can be exploited in your specific environment, and what the realistic business impact would be if an attacker used it. Your development team receives a prioritised fix list, not an undifferentiated wall of findings that creates paralysis instead of action.
5. Reporting
Delivered within 7–10 working days. The technical report maps every finding to the exact file name, line number, vulnerable code snippet, risk rating, and a secure fix example written in your language. The executive summary gives leadership a clear business-risk picture without requiring them to read a single line of code. Compliance teams receive framework-mapped findings ready for ISO 27001, PCI-DSS, and SOC 2 submission.
6. Follow-up Support
The engagement does not end at delivery. After your team applies fixes, iSecNet retests every remediated finding to confirm vulnerabilities are genuinely resolved — not patched superficially or accidentally reintroduced. Ongoing support is available for development teams building secure coding practices into their standard workflow beyond the immediate engagement.
Frequently Asked Questions
Everything you need to know about source code security review.
SAST (Static Application Security Testing) uses automated tools like Semgrep or SonarQube to scan code against known vulnerability patterns — fast and broad, but with false positive rates of 30–40% and zero ability to understand business logic. Manual code review involves a security analyst reading the code as a developer and thinking like an attacker — identifying logic flaws, insecure design decisions, and multi-step vulnerabilities no tool can detect. iSecNet performs both: SAST for breadth, manual review for depth and zero false positives in the final report.
You can share your full codebase or specific modules — iSecNet works either way. A full codebase review gives the most comprehensive coverage and finds vulnerabilities in shared libraries, authentication modules, and data handling layers. A targeted review of specific modules (payment processing, authentication, API layer) is faster and more cost-effective when you have a defined high-risk area. All code is shared under a signed NDA before access, stored securely, and deleted after the engagement is complete.
Hardcoded secrets are API keys, database passwords, JWT signing keys, AWS credentials, or other sensitive values embedded directly in source code instead of environment variables or a secrets manager. Anyone who accesses the code — a new employee, a contractor, or an attacker who finds your repository on GitHub — immediately has production credentials. iSecNet scans every file for hardcoded secrets using pattern matching and entropy analysis, and checks your git history for secrets that were committed and later deleted but remain in version control.
iSecNet checks for: use of broken algorithms (MD5, SHA-1 for passwords, DES/3DES for encryption), hardcoded encryption keys or IVs, predictable random number generation using Math.random() in security contexts, improper JWT signing (using 'none' algorithm or weak secrets), insecure password hashing (storing passwords as plain MD5 instead of bcrypt/Argon2), and TLS certificate validation disabled in HTTP client code — a common shortcut developers use during testing that gets shipped to production.
iSecNet delivers a Technical Report with every finding mapped to the exact file name and line number, the vulnerability category, a code snippet showing the insecure pattern, a risk rating (Critical/High/Medium/Low), and a specific fix recommendation with a secure code example. You also receive an Executive Summary for non-technical stakeholders. The report is delivered within 7–10 working days, and iSecNet includes a free re-review of remediated findings.
Yes. ISO 27001 Annex A Control 8.28 (Secure Coding) explicitly requires organisations to apply secure coding principles and review code for vulnerabilities. SOC 2 Trust Service Criteria CC8.1 requires security review of code changes. PCI-DSS Requirement 6.3 mandates vulnerability identification in custom code before release. iSecNet's code review report maps findings to each relevant control, giving you documented evidence of compliance for auditors.
Know Exactly What Is in Your Code — Before an Attacker Does.!
SQL injection paths, hardcoded secrets, broken authentication logic — they pass every functional test and fail every security one. iSecNet's source code review finds them at line level, with zero false positives and fix guidance your developers can act on before the release ships.