Open-Source Security · OWASP

CheatSheetSeries

OWASP Cheat Sheet Series is a curated reference library of concise security best practices for application developers, maintained by OWASP as a flagship project. It provides practical guidance on topics like authentication, injection prevention, and secure coding patterns rather than executable code.

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Source: GitHub — github.com/OWASP/CheatSheetSeries

32.5k

GitHub stars

4.5k

Forks

Python

Primary language

CC-BY-SA-4.0

License (Requires review (not clearly OSI))

Key facts

Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.

Field	Value
Repository	OWASP/CheatSheetSeries
Owner	OWASP
Primary language	Python
License	CC-BY-SA-4.0 — Requires review (not clearly OSI)
Stars	32.5k
Forks	4.5k
Open issues	41
Latest release	Unknown
Last updated	2026-07-06
Source	https://github.com/OWASP/CheatSheetSeries

What CheatSheetSeries is

A documentation and reference resource built with Python and hosted as a static website, containing markdown-sourced cheat sheets on application security topics. The project includes local build capability via Python/Make and container deployment (Docker/Podman), with markdown linting and terminology checks.

Quickstart

Get the CheatSheetSeries source

Clone the repository and explore it locally.

terminalbash

1git clone https://github.com/OWASP/CheatSheetSeries.git2cd CheatSheetSeries3# follow the project's README for install & configuration

Need it deployed, integrated, or customized instead? DEV.co ships production installs.

Best use cases

Developer Security Training & Onboarding

Quick reference for engineering teams to understand and implement OWASP-endorsed security practices across common vulnerability categories (injection, XSS, CSRF, etc.).

Security Code Review Checklist

Use cheat sheets as standards and checklist items during peer review and pull request approval workflows to enforce consistent security patterns.

Architecture & Threat Modeling Reference

Inform secure design decisions and threat models by consulting topic-specific guidance on authentication, session management, and data protection strategies.

Implementation considerations

Reference content is intended for use via the official website (cheatsheetseries.owasp.org), not by importing markdown source files directly into external documentation.
Local or container-based builds require Python 3.x, npm (for linting), and Make/Docker tooling; ensure CI/CD compatibility if automating offline site generation.
Content updates depend on community contribution; no automated release cadence exists, so verify freshness of specific topics against known vulnerability patterns and frameworks.
Linting and terminology checks require npm tooling; incorporate into your documentation review workflow if standards consistency is critical.
Access control and governance: OWASP materials are openly licensed and require no subscription, but internal policies may dictate how teams can consume and distribute them.

When to avoid it — and what to weigh

Seeking Automated Security Testing or Scanning — This is a documentation library, not a SAST/DAST tool. It provides guidance to inform manual and automated testing, not automated vulnerability detection.
Needing Compliance-Specific or Regulatory Guidance — Cheat sheets cover security best practices but may not address specific compliance frameworks (HIPAA, PCI-DSS, GDPR) in detail—verify alignment with regulatory requirements independently.
Expecting Framework-Specific Implementation Code — Cheat sheets are language- and framework-agnostic reference material; they do not provide ready-to-use code libraries or SDKs for direct integration.
Projects Requiring Offline-Only Content Without Build — While a ZIP bundle is available for offline use, consuming the repository source directly requires Python and Make tooling to generate the website locally.

License & commercial use

CC-BY-SA-4.0 (Creative Commons Attribution Share Alike 4.0 International). This is a creative content license, not a software license. It requires attribution and mandates that derivative works use the same license.

CC-BY-SA-4.0 permits commercial use, but requires clear attribution to OWASP and any derivative or modified content must also be licensed under CC-BY-SA-4.0. Internal use within a commercial organization is permitted; redistribution or incorporation into proprietary products requires careful license compliance review. Consult legal counsel if integrating substantially into commercial offerings.

DEV.co evaluation signals

Editorial assessment — not user reviews. Directional, with an explicit confidence level.

Signal	Assessment
Maintenance	Active
Documentation	Strong
License clarity	Clear
Deployment complexity	Low
DEV.co fit	Good
Assessment confidence	High

Security considerations

This is a reference and educational resource, not a security product. It does not perform scanning, cryptography, or access control. Security consideration: ensure teams understand that consuming cheat sheets does not substitute for threat modeling, code review, or penetration testing. Verify recommendations align with your application architecture, threat model, and dependencies (e.g., framework versions). Community-driven content; while OWASP maintains editorial standards, individual contributions are not subject to formal security audit.

Alternatives to consider

NIST Cybersecurity Framework & NIST Guidelines

Official U.S. government guidance on application security and cryptography; often required for federal/regulated contexts; more compliance-oriented than OWASP.

CWE/CAPEC (MITRE)

Structured taxonomy of weaknesses and attack patterns; useful for threat modeling and risk classification, but less actionable than prescriptive cheat sheets.

Internal Security Runbooks & Design Documents

Organization-specific guidance tailored to your architecture, frameworks, and risk appetite; complements OWASP but cannot be fully replaced by external references.

Software development agency

Build on CheatSheetSeries with DEV.co software developers

Integrate OWASP Cheat Sheet Series into your team's security training, code review, and threat modeling workflows. Start with the official website or deploy locally for offline access.

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CheatSheetSeries FAQ

Can we use OWASP Cheat Sheet Series content in our internal security training?

Yes. CC-BY-SA-4.0 permits internal use. You must attribute OWASP; if you modify content, derivatives must use the same license. Consult your legal team if integrating into commercial training products.

Is there an official API or programmatic way to consume cheat sheet data?

No. Primary consumption is via the website (cheatsheetseries.owasp.org) or by building the static site locally from markdown sources. No REST API or data export format is documented.

How frequently are cheat sheets updated?

Unknown fixed cadence. The project is actively maintained (recent pushes, open issues) and driven by community contribution. Check the GitHub repository for topic-specific update history or the official website for publication dates.

Can we host a private mirror for offline use?

Yes. The offline ZIP bundle and container build (Docker/Podman) support local hosting. Ensure attribution to OWASP is preserved and that your internal use complies with CC-BY-SA-4.0 terms.

Custom software development services

DEV.co helps companies turn open-source tools like CheatSheetSeries into production software. Our software development services cover the full lifecycle — architecture, web development, integration, and maintenance — delivered by software developers and web developers who ship. Engage our software development agency to implement or customize it for your open-source security stack.

Secure Your Development Process with OWASP Guidance

Integrate OWASP Cheat Sheet Series into your team's security training, code review, and threat modeling workflows. Start with the official website or deploy locally for offline access.

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