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OWASP Security Checklist

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Complete OWASP Top 10 implementation guide with code examples, testing scripts, and remediation patterns.

📁 32 files
MarkdownJavaScriptPythonCI/CD

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📁 File Structure 32 files

owasp-security-checklist/ ├── LICENSE ├── README.md ├── docs/ │ ├── A01-broken-access-control.md │ ├── A02-cryptographic-failures.md │ ├── A03-injection.md │ ├── A04-insecure-design.md │ ├── A05-security-misconfiguration.md │ ├── A06-vulnerable-and-outdated-components.md │ ├── A07-identification-and-authentication-failures.md │ ├── A08-software-and-data-integrity-failures.md │ ├── A09-security-logging-and-monitoring-failures.md │ ├── A10-server-side-request-forgery.md │ ├── remediation-checklist.md │ └── secure-coding-quick-reference.md ├── examples/ │ ├── access-control/ │ │ ├── fixed.py │ │ └── vulnerable.py │ ├── crypto/ │ │ ├── fixed.py │ │ └── vulnerable.py │ ├── injection/ │ │ ├── fixed.js │ │ ├── fixed.py │ │ ├── vulnerable.js │ │ └── vulnerable.py │ └── ssrf/ │ ├── fixed.py │ └── vulnerable.py ├── free-sample.zip ├── guide/ │ ├── 01-introduction-to-owasp-top-10.md │ ├── 02-access-control-and-crypto-failures.md │ ├── 03-injection-insecure-design-misconfiguration.md │ ├── 04-vulnerable-components-auth-integrity.md │ └── 05-logging-monitoring-ssrf.md ├── index.html └── tests/ └── test_examples.py

📖 Documentation Preview README excerpt

OWASP Top 10 (2021) — Implementation & Testing Guide

A complete, hands-on reference for the OWASP Top 10:2021. Every category gets

a plain-English explanation, paired vulnerable-vs-fixed code in multiple

languages, concrete test procedures, a remediation checklist, and links

to authoritative secure-coding references. Ten of the example pairs are runnable,

and a test suite proves the fixes actually hold.

Built for engineers who have to ship secure code and prove it — not just read

about it. No tool licenses, no cloud account, no dependencies beyond Python's

standard library and Node's built-ins.

Table of Contents

1. [Who this is for](#who-this-is-for)

2. [What's included](#whats-included)

3. [How to use it](#how-to-use-it)

4. [Run the examples and tests](#run-the-examples-and-tests)

5. [The OWASP Top 10:2021 at a glance](#the-owasp-top-102021-at-a-glance)

6. [File-by-file guide](#file-by-file-guide)

7. [FAQ](#faq)

8. [License](#license)

9. [Support](#support)

Who this is for

  • Backend / full-stack engineers who want a practical checklist and copyable

fixes, not a 200-page standard.

  • Tech leads running secure code review and threat modeling.
  • Security engineers / AppSec onboarding teams to the Top 10 with real examples.
  • Candidates preparing for security-focused interviews who want crisp,

example-backed explanations.

Assumes working knowledge of HTTP, SQL, and either Python or JavaScript. No prior

security specialization required.

What's included

ContentFilesDetails
Per-category guides10One deep-dive per Top 10 category (A01–A10)
Secure-coding quick reference1Use/avoid tables for crypto, injection, headers, more
Remediation checklist1Copy-into-tracker checklist + threat-model + release gate
Vulnerable/fixed examples10Runnable pairs: injection, access control, SSRF, crypto (Python + JS)
Verification test suite1Proves the fixes resist the attacks (unittest, stdlib only)

Each category guide follows the same structure: **what it is → why it matters →

vulnerable vs. fixed code → how to test (manual + automated) → remediation

checklist → secure-coding references** with CWE mappings.

How to use it

... continues with setup instructions, usage examples, and more.

📄 Code Sample .py preview

tests/test_examples.py #!/usr/bin/env python3 """Verification tests for the OWASP example pairs. These tests prove two things for each vulnerable/fixed pair: 1. The FIXED version resists the attack (the security property holds). 2. Where safe to demonstrate, the VULNERABLE version is actually exploitable (so the contrast is real, not cosmetic). Run from anywhere with the standard library only: python3 -m unittest discover -s tests # from the product root python3 tests/test_examples.py # direct The example directories use hyphens, so we load each module by file path with importlib rather than a normal import. """ from __future__ import annotations import importlib.util import pathlib import unittest ROOT = pathlib.Path(__file__).resolve().parent.parent EXAMPLES = ROOT / "examples" def _load(rel_path: str): """Load a module from a path relative to the examples/ directory.""" path = EXAMPLES / rel_path name = rel_path.replace("/", "_").replace(".py", "") spec = importlib.util.spec_from_file_location(name, path) assert spec and spec.loader, f"cannot load {path}" module = importlib.util.module_from_spec(spec) spec.loader.exec_module(module) return module class TestInjection(unittest.TestCase): def setUp(self): self.vuln = _load("injection/vulnerable.py") self.fixed = _load("injection/fixed.py") def test_vulnerable_allows_auth_bypass(self): conn = self.vuln.build_db() # The classic payload bypasses the password check in the vulnerable code. self.assertTrue(self.vuln.login_insecure(conn, "admin", "' OR '1'='1")) def test_fixed_rejects_injection(self): conn = self.fixed.build_db() self.assertFalse(self.fixed.login_secure(conn, "admin", "' OR '1'='1")) # ... 95 more lines ...
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