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Code Security Review: A Practical Checklist for Teams

A complete code security review checklist covering authentication, input validation, cryptography, secrets management, dependency security, and AI-generated code — with actionable checks for every PR.

A code security review is the systematic examination of source code to identify vulnerabilities, misconfigurations, and security weaknesses before code reaches production. It goes beyond functional code review (does it work?) to ask: can this code be exploited?

This guide provides a working checklist your team can apply to every pull request — covering the categories where vulnerabilities most commonly hide.

When to Conduct a Security Review

Not every code change needs a full security review. Prioritise based on risk:

Always review (high risk):

  • Authentication and authorization changes
  • Payment or financial transaction logic
  • Cryptographic implementations
  • Infrastructure as Code changes to production
  • API endpoint changes that handle user input
  • Changes to access control or permission models
  • Dependencies added or upgraded

Review on significant changes (medium risk):

  • Database queries and data access patterns
  • File upload or download functionality
  • External API integrations
  • Configuration changes
  • Error handling and logging modifications

Automated scanning sufficient (lower risk):

  • UI-only changes with no data handling
  • Documentation updates
  • Test-only changes
  • Styling and layout modifications

The Checklist

1. Authentication & Session Management

  • Passwords are hashed with bcrypt, argon2, or scrypt — never MD5 or SHA-1
  • Session tokens are cryptographically random with sufficient entropy (128+ bits)
  • Session tokens expire after a reasonable inactivity period
  • Failed login attempts are rate-limited (account lockout or progressive delays)
  • Multi-factor authentication is enforced for sensitive operations
  • Password reset tokens are single-use and time-limited
  • Authentication logic does not leak information (same response for valid/invalid usernames)
  • OAuth/OIDC flows validate state parameters and nonce values
  • JWT tokens are validated for signature, expiration, and issuer

2. Authorization & Access Control

  • Every API endpoint enforces authorization (not just authentication)
  • Server-side authorization checks cannot be bypassed by client-side manipulation
  • Role-based access follows principle of least privilege
  • Direct object references are validated against the authenticated user’s permissions
  • Admin functionality is separated and requires elevated authentication
  • Horizontal privilege escalation is prevented (user A cannot access user B’s resources)
  • API rate limiting is applied per-user and per-endpoint

3. Input Validation & Injection Prevention

  • All user input is validated on the server side (client-side validation is supplementary only)
  • SQL queries use parameterised statements or prepared statements — never string concatenation
  • HTML output is encoded to prevent cross-site scripting (XSS)
  • File paths are validated to prevent path traversal (../ attacks)
  • XML parsing disables external entity processing (XXE prevention)
  • Command injection is prevented by avoiding shell execution with user input
  • Regular expressions are checked for ReDoS (catastrophic backtracking) potential
  • Content-Type headers are validated on file uploads
  • Input length limits are enforced to prevent buffer-overflow-style attacks

4. Cryptography

  • No deprecated algorithms in use (MD5, SHA-1, DES, RC4, ECB mode)
  • AES uses GCM mode (authenticated encryption), not ECB or CBC without HMAC
  • RSA keys are 2048 bits minimum (4096 preferred)
  • Random number generation uses cryptographically secure sources (secrets module in Python, crypto.randomBytes in Node)
  • IVs and nonces are never reused
  • Secrets are not derived from predictable sources
  • TLS 1.2+ is enforced for all external communication
  • Certificate validation is not disabled (no verify=False or rejectUnauthorized: false)

5. Secrets & Credentials

  • No hardcoded credentials, API keys, or tokens in source code
  • No secrets in configuration files committed to version control
  • Environment variables or secrets management (Vault, AWS Secrets Manager) used for all credentials
  • Secrets are not logged in application output or error messages
  • API keys are scoped to minimum required permissions
  • Credentials are rotated on a defined schedule
  • Test/development credentials are clearly separated from production

6. Dependency & Supply Chain Security

  • Dependencies are pinned to specific versions (no open ranges like ^ or *)
  • New dependencies are from well-maintained, reputable packages
  • Known vulnerabilities in dependencies are checked (SCA scan passes)
  • Lock files (package-lock.json, yarn.lock, Pipfile.lock) are committed and up to date
  • No unnecessary dependencies added (minimise attack surface)
  • License compatibility is verified for new dependencies
  • Package names are verified (not typosquatted variants)

7. Error Handling & Logging

  • Errors do not expose stack traces, internal paths, or system information to users
  • Sensitive data (passwords, tokens, PII) is never written to logs
  • Security-relevant events are logged (login attempts, permission failures, data access)
  • Logs include sufficient context for incident investigation (timestamp, user, action, resource)
  • Exception handling does not swallow errors silently
  • Error responses do not differ based on the existence of resources (prevents enumeration)

8. Infrastructure as Code

  • IAM policies follow least privilege (no "Action": "*" or "Resource": "*")
  • Security groups do not allow unrestricted ingress (0.0.0.0/0) on management ports
  • Storage resources (S3, EBS, RDS) have encryption enabled
  • Logging is enabled (CloudTrail, VPC flow logs, access logs)
  • Public access is explicitly denied unless required and documented
  • Container images do not run as root
  • Kubernetes pods have resource limits and network policies defined

9. AI-Generated Code (Additional Checks)

In 2026, AI-generated code requires additional scrutiny due to consistent vulnerability patterns:

  • No placeholder credentials (e.g., password = "admin123" # TODO: change)
  • Input validation is present (AI frequently omits it)
  • Cryptographic implementations use modern algorithms (AI defaults to deprecated ones)
  • IaC configurations are not overly permissive (AI defaults to * permissions)
  • Package names are verified (AI hallucinate package names that attackers register)
  • Authentication logic includes all edge cases (AI handles happy path only)
  • SQL queries use parameterised statements (AI still produces string concatenation)

Automating the Review

Manual code security review is valuable but doesn’t scale. The most effective approach combines automation with human judgement:

Automated (every PR, no exceptions)

  • SAST scanning for known vulnerability patterns
  • Secret detection across 2,000+ patterns
  • SCA for dependency vulnerabilities
  • IaC scanning for misconfigurations
  • PR-level quality gates that block merge on critical findings

Human review (risk-based, for qualifying changes)

  • Authentication and authorization logic
  • Cryptographic implementations
  • Complex business logic with security implications
  • Infrastructure changes to production
  • AI-generated code in sensitive areas

AI-assisted (augments both)

  • GenAI-powered remediation suggestions for automated findings
  • AI-generated fix patches that maintain code style and context
  • Automated triage that prioritises findings by exploitability

How Cloudanix Supports Code Security Review

Cloudanix Code Security automates the scanning portion of code security review:

  • PR-level scanning — every pull request is automatically scanned for vulnerabilities, secrets, and misconfigurations before merge
  • SAST + SCA + Secrets + IaC — covers all categories in the checklist above with a single integration
  • AI-powered remediation — findings come with GenAI fix suggestions that reduce resolution time from days to minutes
  • Code-to-runtime correlation — findings from code review are contextualised with cloud posture, helping teams prioritise what matters in production
  • GitHub and Bitbucket integration — one-click connect, findings as PR comments, JIRA ticket creation

For AI-generated code specifically, combining code scanning with Coding Agent Guardrail addresses both the output (vulnerabilities in generated code) and the actor (the agent’s access to secrets and credentials during generation).


Related Resources

What Our Users Are Saying

Customer Reviews

Cloudanix is trusted by security leaders worldwide to deliver proactive, reliable, and cutting-edge cloud security.

One day, I changed the password of a root account, and my CTO called me within less than a minute to confirm if I did so. I was not expecting a reaction this quick. He told me Cloudanix alerted him of this password change and that he wanted to confirm as it was a critical security notification. I couldn't believe it!

Ritesh Agarwal
Ritesh Agarwal
CEO, Airgap Networks

Compliance is one way of staying secure, but what I want is the ability to go deeper and attain 'true security.' Cloudanix provides us the capability to do so.

Vishal Madan
Vishal Madan
Head of Engineering, iMocha

Cloudanix is building for the future of the cloud, which makes the product all the more desirable.

Ritesh Agarwal
Ritesh Agarwal
CEO, Airgap Networks

Cloudanix gave us the visibility we were missing. Being able to move from permanent access to a robust Just-In-Time (JIT) workflow has fundamentally changed our security posture without slowing down our engineering velocity.

Pavan Kumar Lekkala
Pavan Kumar Lekkala
SRE Lead, HugoHub

We are excited to leverage Cloudanix's comprehensive multi-cloud DevSecOps solution to secure our production workloads on AWS. Cloudanix has demonstrated that it can solve many challenges that DevSecOps teams face while continually adding new features such as SOC2 compliance and drift detection.

Satish Mohan
Satish Mohan
Co-founder & CTO, Airgap Networks

Managing third-party partner access was once a major concern for our security posture. With Cloudanix JIT Cloud, we've effectively achieved zero third-party risk. We can now grant access confidently, knowing that it is temporary, audited, and automatically revoked, resulting in a 100% reduction in our privileged access exposure.

Okesh Badhiye
Okesh Badhiye
Head of Technical Engineering, Finfinity

The snooze feature and responsible alerts have helped us save time and prioritize what to tackle first.

Satish Mohan
Satish Mohan
Co-founder & CTO, Airgap Networks

Implementing Cloudanix JIT internally allowed us to practice what we preach. By eliminating permanent access to our own clouds and databases, we've neutralized the risk of standing privileges, ensuring our own 'keys to the kingdom' are never left exposed.

Girish Manghnani
Girish Manghnani
Managing Partner, Tech Inspira

The problem with permissions is a lot of times, the gaps are left open due to oversights from inside the organization itself. With Cloudanix's CIEM, we get a complete view of user permissions and access. This enables us to update the permissions, reducing the attack surface.

Nilesh Pethani
Nilesh Pethani
Application Architect, iMocha

In the world of Fintech, trust is our currency. Cloudanix provided the frictionless visibility we needed to secure our EKS workloads across AWS, ensuring we stay audit-ready for SOC2 and GDPR without slowing down our engineering velocity.

Amol Naik
Amol Naik
Head of Security & Infrastructure, HugoHub

Cloudanix delivered value within 5 minutes of onboarding. Continuous monitoring, timely detection, and excellent documentation helped us attain a great cloud security posture.

Divyanshu Shukla
Senior DevSecOps, Meesho

Technology strategies and business strategies are in a state of constant change which includes centralization and decentralization of responsibilities. Regardless of strategic shift, we still have intellectual property to protect. Cloudanix are critical partners for us in our public cloud security posture across our three cloud providers.

Jerry Locke
Jerry Locke
Senior Director Global Solutions Engineering, Eversana

Cloudanix has been amazing. They opened up a common Slack channel with us — and it feels like we are talking to our own team and getting things done with Cloud security. The support team is always available, friendly, helpful, and ready to go out of their way.

Satish Mohan
Satish Mohan
CTO, Airgap Networks

Beyond just access management, Cloudanix CSPM has given us a unified view of our AWS environment. The real-time alerting and anomaly detection allow us to prevent any untoward activity before it happens, which is critical for a marketplace connecting 50+ financial institutions.

Okesh Badhiye
Okesh Badhiye
Head of Technical Engineering, Finfinity

For a Fintech company, data is our most valuable — and most sensitive — asset. Cloudanix DAM hasn't just improved our visibility; it has given us control. The ability to mask data and prevent unauthorized queries in real-time is a game-changer for our compliance and customer trust.

Jiten Gala
Jiten Gala
President Engineering and Product, Kapittx

Our clients, especially in the Middle East financial sector, demand absolute accountability. Cloudanix JIT Cloud has been a competitive differentiator for us, allowing us to provide secure, governed access to customer accounts that meet their strictest audit and compliance requirements.

Girish Manghnani
Girish Manghnani
Managing Partner, Tech Inspira

Cloudanix is always on my team's lips because of its exceptional support. Be it a small or big query, Cloudanix has gone above and beyond to resolve them. This one's a keeper for us.

Sujit Karpe
Sujit Karpe
CTO, iMocha

For a long-lasting partnership, great support goes a long way. Cloudanix has delivered exceptional support whenever required. Their edge is their team is always ready to go beyond to solve any issues that we have. This speaks volumes about the culture at Cloudanix.

Akash Maheshwari
Akash Maheshwari
Co-founder, MoveInSync

Beyond the technology, Cloudanix feels like an extension of our own team. Their willingness to stand up a dedicated Middle East tenant for us and provide exceptional support at a sensible price makes them a long-term partner for Hugosave.

Surya Tamada
Surya Tamada
CTO, HugoHub

The real-time notifications that Cloudanix provides are a real lifesaver. Their adaptive notifications ensure that my team stays productive and doesn't get interrupted all the time.

Digvijay Singh
Staff Security Engineer, Meesho

The whole point in technological evolution is to help improve the world we live in. We must protect that and to do so requires an effective and efficient security strategy. The Cloudanix team helped make our public cloud security posture management strategy a reality. The symbiotic relationship we have allows for a continuous feedback loop which is how business should operate.

Larry Wheat
Larry Wheat
Staff Solutions Engineer, Eversana

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