Source Code Review · Secure development

Secure source code review from Sumrite that finds flaws before production does.

Some vulnerabilities only exist in code: weak crypto, dangerous deserialization, and secrets committed by mistake. We review with engineers who ship fixes developers can merge.

What this helps you achieve

Catch issues pentests miss

See design-level flaws early in the release cycle.

Protect IP and customer trust

Reduce backdoors, credentials, and unsafe library use.

Speed secure releases

Line-level guidance instead of another dashboard.

Support diligence

Independent code security view for boards and acquirers.

Request a Code Review. Private repo · NDA standard

CERT-In empanelled · India

Get a CERT-In empanelled VAPT report.

Sumrite’s testers run your source code review by hand, and the report is issued through a CERT-In empanelled auditor. One team from scoping to sign-off, built for Indian regulators, enterprise buyers and government work.

  • Accepted where it is requiredRegulators, auditors and procurement teams that ask for a CERT-In empanelled auditor’s report, including SEBI-regulated entities and government and PSU contracts.
  • One team, one contractSumrite handles scoping, testing, the report and the retest. You do not manage a second vendor.
  • Real testing, not a scanManual exploitation with evidence for every finding, and a retest after your fixes.

Can Sumrite also arrange the formal step for me?

Yes. We run the full engagement for you and route the formal attestation through our network of CERT-In empanelled partner auditors, so you deal with one team from scoping to report.

What is a secure source code review?

A secure source code review is an expert-led read of your application's code by a security engineer, looking for vulnerabilities that are hard or impossible to find by testing the running app. Some flaws only show up in the code: an authorisation check that is missing on one route, weak or home-made cryptography, unsafe deserialisation, secrets committed by mistake, or a helper function that trusts user input everywhere it is used. Static analysis tools are used to point at likely problem areas, but the review itself is done by a person who reads the logic and decides whether it is actually exploitable. The work focuses on the code that matters most, such as authentication, payments, access control and data handling, and follows the OWASP Code Review Guide and CWE Top 25. Each finding is mapped to the file and function, with a fix written for your stack.

Languages and frameworks Sumrite reviews

LanguageCommon frameworks
JavaScript and TypeScriptNode.js, Express, NestJS, Next.js, React, Angular, Vue
PythonDjango, Flask, FastAPI
Java and KotlinSpring Boot, Jakarta EE, Android
C#.NET, ASP.NET Core, WinForms and WPF
PHPLaravel, Symfony, WordPress plugins
GoStandard library, Gin, Echo
SwiftiOS applications

Confirm your stack when you request a quote; other languages are reviewed on request.

Manual code review vs SAST tools

SAST toolSumrite manual review
FindsKnown patterns, such as unsafe functions and injectable queriesLogic flaws, missing authorisation checks and insecure design
False positivesMany; each needs triageFindings confirmed reachable against a running build
ContextNone: it reads code without knowing what it should doReviewer learns the intended behaviour first, then looks for the gaps

What Source Code Review covers

AreaWhat we checkExample finding
Authentication and authorisationMissing or inconsistent checks across routes and servicesAn admin endpoint that checks login but not role
CryptographyAlgorithms, key management, randomness, password storagePasswords hashed with an unsalted fast hash
Input and output handlingInjection, deserialisation, template and path handlingUser input passed straight into a database query
Secrets and configurationKeys, tokens and credentials in code or historyA production API key in a committed config file
Dependencies in contextHow vulnerable libraries are actually usedA vulnerable parser reachable from an upload endpoint

How an engagement runs

  1. Scope and NDA. Tell us what needs testing and why. You get a fixed-price quote and an NDA is signed before any technical detail changes hands.
  2. Rules of engagement. Targets, test windows, accounts, safety contacts and anything off-limits are agreed in writing before testing starts.
  3. Expert-led testing. A researcher tests by hand, using tools to speed up the routine parts. Every finding is reproduced and confirmed before it is reported.
  4. Report. An executive summary for leadership, then each finding with a CVSS severity, the evidence, steps to reproduce and a fix your team can apply.
  5. Re-test. Once fixes are in, we test them again and record the result, so the final report shows what was found and what is now closed.

Source Code Review: common questions

Which languages do you review?

Common web and mobile stacks, including JavaScript and TypeScript, Python, Java, C#, PHP, Go, Kotlin and Swift. Confirm your stack when you request a quote.

Read this in the FAQ →

Is code review better than a penetration test?

They find different things. A penetration test shows what an attacker can exploit from outside; a code review finds flaws in logic and design that may never be reachable in testing. Critical applications benefit from both.

Read this in the FAQ →

How do you handle our source code?

Access is read-only and covered by an NDA signed before anything is shared. Code is reviewed in the agreed environment and access is removed when the engagement closes.

Read this in the FAQ →

See all Source Code Review questions in the FAQ →

We run the full engagement for these frameworks, and where a formal audit or attestation is needed we route it through our local partner firms, so you deal with one team.

Related services

Further reading

The problem & our approach

Runtime testing cannot see every mistake in your source.

One insecure helper or crypto routine can undermine a solid application. Dependency alerts alone do not explain how your code uses them.

Sumrite's Source Code Review targets auth, payments, crypto, and deserialization per OWASP Code Review guidance.

  • Findings mapped to files and functions
  • Practical fixes for your stack
  • Executive summary included
For engineering & security teams

Technical overview

Methodology, scope, and deliverables in plain terms.

How we test

Expert-led review with targeted static analysis; CWE Top 25 and OWASP secure coding focus.

  • Web backends and APIs
  • Shared mobile libraries
  • Critical modules you nominate

What you receive

Severity-rated issues, code references, and example fixes. Retest of critical items when bundled with VAPT.

OWASP Code Review GuideCWE Top 25SANS Top 25
Simple process

Your Source Code Review journey

Every step from scope and NDA to a retested, final report, shown for Source Code Review. No jargon, no surprises.

Step 1 of 6

Request your source code test

Submit your scope so our team can plan the engagement and get started.

  • Read-only repository access and the language and framework list
  • A walkthrough of architecture and trust boundaries
  • Priority areas: authentication, payments, personal data
  • NDA signed before any code is shared
Step 2 of 6

Expert assessment: Source Code Review

Every phase is run by a security expert, with tools used only to speed up the routine parts. Findings are reproduced and confirmed before they reach your report.

Threat-led mapping

  • Entry points, trust boundaries and sensitive data flows

Security-critical paths

  • Authentication, session and access-control logic
  • Input handling, injection sinks and deserialisation
  • Cryptography and secrets management

Dependencies and build

  • Vulnerable and abandoned dependencies
  • CI/CD pipelines, build scripts and leaked secrets

Validation

  • Confirming exploitable findings against a running build where possible
Expert-only work: beyond scanners and AI
  • Understanding what the developer intended and where it breaks
  • Spotting logic flaws that no pattern-matcher flags
  • Separating reachable vulnerabilities from dead code
  • Reviewing custom crypto and authorisation frameworks
Step 3 of 6

Draft report in 48 hours

Findings are written for two readers at once: developers who need the exact fix and auditors or buyers who need confidence.

  • Executive summary for leadership and auditors
  • CVSS-rated findings with proof of exploitation
  • Step-by-step reproduction for your engineers
  • Mapped to the framework you named in scope
Step 4 of 6

Fix the vulnerabilities

Your team fixes the issues with guidance written for your stack, and the tester who found each issue answers questions directly.

  • Fix guidance per finding, in plain language
  • Prioritised order so critical issues go first
  • Direct line to the tester, no account-manager relay
Step 5 of 6

Re-validation, included

Every fix is tested again. Nothing is marked closed on trust.

  • Each fix re-tested, with before and after evidence
  • Regression checks on related functionality
  • Status per finding: fixed, partly fixed or open
  • Retest included at no extra cost
Step 6 of 6

Final report issued

You receive a verified report in your company name, ready for clients, auditors and procurement.

  • Issued in your company name
  • Updated with retest results
  • Dated and scoped to the assets tested
  • Re-issued after major product changes

Preparing a release or audit?

Share language, repo size, and timeline. We scope it fast.

Request a Code Review. Or run a free scan