Real AppSec
case by case repository
Developer? DevOps? AppSec? DevSecOps? Security Engineer? Study realistic production security cases inside GitHub repository and build your own long-term advanced security knowledge base.
Not a video course. Not an interactive lab.
Why appsec-forge
Learn like a strong engineer works.
GitHub-native Learning
Study directly inside GitHub repositories — no external platforms, no sandboxes. Public is open. Pro is private.
Study Ready-Made Work
Every case is ready to study: feature, vulnerability, exploit, remediation, and rationale. No setup. No execution.
Real-world Engineering Cases
Every case recreates real engineering problems, not simplified training exercises.
Engineer to Engineer
For Developers, DevOps, AppSec, DevSecOps, Security Engineers — content mirrors the decisions made in real work.
Learn What Matters Today
Start from the language, framework, infrastructure, or supply chain you already use.
Level Up Security Skills
Build practical skills across vulnerabilities in code, infrastructure, CI/CD, and AI systems.
Repository Structure
Organized by root causes of vulns — how engineers navigate repos.
Start with your language, uncover real‑world security cases.
language/
Choose your programming language.
context/
Focus on the application type you're building.
framework/
Narrow down to your framework or stack.
case/
Study a complete real-world security cases.
Cases Library
A growing security engineering knowledge base.
JWT Algorithm Confusion
Most common case in Python.
Docker Socket Escape
Workspaces, roles & permissions, and real-time commenting shipped.
GitHub Actions Secrets Exposure
Workspaces, roles & permissions, and real-time commenting shipped.
Inside Every case
Every scenario is designed to be studied, not executed.
Compare vulnerable and fixed implementations — no sandbox required.
Learning Workflow
Discover -> Understand -> Apply
Discover
Browse the repository, watch the accompanying YouTube walkthrough, and explore the case files. Everything is ready to study immediately — no environment setup, installations, or lab preparation required.
Understand
Follow the case from feature to exploit, vulnerable implementation, fix, DevSecOps guidance, and security artifacts. Learn not only what changed, but why the vulnerability appeared and how experienced engineers addressed it.
Apply
Transfer the same thinking into your daily work. Recognize similar patterns during code reviews, design safer implementations, improve CI/CD pipelines, and make security decisions with greater confidence.
Studying with Cases
Every role follows the same learning path while focusing on different engineering decisions and security responsibilities.
Follow the implementation from feature to secure code and learn how experienced engineers identify, fix, and avoid security flaws in everyday development.
Understand Feature
Learn the engineering context, expected behavior, and security assumptions behind the feature.
Analyze Vulnerability
Identify the root cause and understand why the implementation became insecure.
Explore Exploit
See how the weakness can be abused through realistic attack techniques.
Compare Fix
Review secure implementation choices and understand what changed.
Review DevSecOps
See which security controls and tooling help identify similar issues during development.
Production Practices
Explore how verification and detection help validate secure implementations and catch similar mistakes.
How Engineers Use appsec-forge
Learn where engineers actually use security knowledge in everyday work.
Before Security Review
Review similar vulnerabilities before opening a pull request and avoid repeating common security mistakes.
During Incident Response
Quickly understand unfamiliar vulnerabilities and compare practical remediation approaches.
Before Interviews
Practice realistic engineering scenarios instead of memorizing vulnerability lists.
Technology Coverage
Browse the technologies featured across the appsec-forge roadmap.
C
Systems Programming Language
C#
Microsoft Programming Language
C++
Systems Programming Language
Go (Golang)
Programming Language
Java
JVM Programming Language
JavaScript
Programming Language
Kotlin
JVM Programming Language
PHP
Web Programming Language
Python
Programming Language
Ruby
Programming Language
Rust
Systems Programming Language
Swift
Apple Programming Language
TypeScript
Typed JavaScript Language
Actix Web
Web Framework
Android
Mobile Framework
Apollo Server
GraphQL Framework
ASP.NET Core
Web Framework
AutoGen
Multi-Agent Framework
CrewAI
Multi-Agent Framework
Django
Web Framework
Express
Web Framework
FastAPI
API Framework
Fastify
Web Framework
Fiber
Web Framework
Flask
Web Framework
Gin
Web Framework
Google Cloud Functions
Serverless Framework
gRPC
RPC Framework
Hugging Face Transformers
Machine Learning Library
iOS
Mobile Framework
LangChain
LLM Framework
LangGraph
Agent Framework
Laravel
PHP Framework
MCP SDK
Model Context Protocol SDK
NestJS
Backend Framework
Next.js
React Framework
OpenAI Agents SDK
Agent Framework
Ruby on Rails
Web Framework
Spring Boot
Java Framework
Docker
Container Platform
Kubernetes
Container Orchestration Platform
Amazon Web Services (AWS)
Cloud Platform
Microsoft Azure
Cloud Platform
Google Cloud Platform (GCP)
Cloud Platform
Terraform
Infrastructure as Code
GitHub Actions
CI/CD Platform
GitLab CI/CD
CI/CD Platform
Jenkins
Automation Server
TeamCity
CI/CD Platform
Anthropic
AI Platform
AWS Bedrock
Managed AI Platform
Azure OpenAI
Managed AI Platform
DeepSeek
AI Platform
Google Gemini
AI Platform
Hugging Face
AI Platform
LiteLLM
LLM Gateway
Meta Llama
Open LLM Family
Mistral AI
AI Platform
Ollama
Local AI Runtime
OpenAI
AI Platform
Vertex AI
Managed AI Platform
Maven
Java Build Tool & Package Manager
pip
Python Package Manager
npm
JavaScript Package Manager
Public vs Pro
Public is an open GitHub repository. Pro adds production-focused remediation and security content in a private GitHub repository.
| Capability | Public | Most PopularPro |
|---|---|---|
| Learning objective | Understand vulnerabilities | Learn production-focused approaches |
| Vulnerability walkthrough | ✓ | ✓ |
| Exploit scenarios | ✓ | ✓ |
| Root cause explanation | ✓ | ✓ |
| Basic remediation | ✓ | ✓ |
| Engineering rationale | ✓ | ✓ |
| Layered remediation | x | ✓ |
| Threat modeling | x | ✓ |
| Hardening guidance | x | ✓ |
| Detection guidance | x | ✓ |
| Security checklists | x | ✓ |
| DevSecOps | Baseline | Baseline + Configs |
| Verification scripts | x | ✓ |
| Detection scripts | x | ✓ |
| Explore Public on GitHub | Get Pro Access |
Why Professionals Choose Pro
Learn rapidly with practical cases focused on how security is implemented in real engineering environments.
Everything in one place
A focused engineering resource without fragmented knowledge spread across countless sources.
Production-oriented solutions
Practical depth that goes beyond surface-level fixes and reflects how real teams approach security.
Proven engineering patterns
Reusable approaches that reduce repeated research and help solve similar challenges with confidence.
Real-world scenarios
Authentic engineering challenges instead of artificial examples designed only for training.
Career-long asset
A growing knowledge base that stays relevant at every stage of your professional practice.
Lifetime ownership
No subscription. No recurring payments. Permanent access to your purchased major version and its updates.
Simple, Transparent Pricing
No subscriptions. No hidden fees. No surprises.
Public and Pro include the same engineering cases. Pro adds security materials and advanced remediation solutions.
Public
GitHub repository with free access
- Current version: v1
- 3 cases (growing to ~100)
- Basic remediation examples
- 1 complete Pro case preview
Pro
Expands Public — Private GitHub repository
- Same 30 v1 cases (growing to ~100)
- Production-oriented remediation
- Security pack for each case
- Instant access after purchase
- All future v1 cases included
- Lifetime access to v1
- Upgrade credit toward future versions
- Refund Policy applies*
* - See Refund Policy
Coming Next
Deep-dive learning and complex solutions
- Elite: Master one stack in depth
- Enterprise: Secure engineering at scale
Meet the Author
Real engineering experience. Practical security education.
Viktor Gurko
AppSec & DevSecOps Engineer • M.S. in IT
For over 7 years, I've worked with developers, DevOps, AppSec, DevSecOps, and Security Engineers facing the same challenge: turning security theory into engineering decisions that hold up in production. With a Master of Science in Information Technology earned in Massachusetts, USA, and hands-on industry experience, I created appsec-forge to bridge the gap between security concepts and real-world implementation. My goal is to help engineers build secure systems with confidence through practical, production-focused learning — because security is everyone's responsibility.
Frequently Asked Questions
Everything you need to know before getting started with appsec-forge.
Is appsec-forge a course?
No. appsec-forge is not an online course, video course, or structured training program.
appsec-forge consists of a free Public GitHub repository (also mirrored on GitLab) and a Private GitHub "Pro" repository.
After purchasing Pro, you immediately receive access to the Private Pro repository containing the same cases, each expanded with additional security content. You can clone the entire library and study it locally.
There are no chapters, predefined learning paths, or hours of video lessons to complete before getting to real engineering work.
appsec-forge follows an example-driven learning approach. Instead of learning from isolated examples or simplified tutorials, you work directly with engineering cases based on real mistakes made by developers, DevOps engineers, and AppSec engineers in production environments.
Every case is self-contained and can be studied independently. Start with the technologies you use today and explore the rest of the library as your career grows.
Is appsec-forge interactive?
No. appsec-forge is not an interactive lab, browser-based training platform, or hands-on cybersecurity playground.
appsec-forge is a GitHub-based case library — not an interactive or hands-on learning platform.
Every case recreates a realistic production scenario, from vulnerable code through remediation, detection, verification, and hardening, so you understand the complete engineering workflow. Everything is studied directly on GitHub, with no environment setup required.
The goal is to build the understanding and intuition you can apply to your own projects, not to memorize or copy-paste solutions.
How do I access Pro?
Access is delivered immediately after purchase.
The Public repository is available for free on GitHub (and mirrored on GitLab).
After purchasing Pro, you immediately receive access to the Private Pro repository, which contains expanded versions of the same cases, additional production-oriented content, and all updates released within your purchased major version.
Do I get lifetime access?
Yes. You receive lifetime access to the major version you purchased.
Every update and every new case released within that major version is included automatically.
Future major versions are sold separately.
How do Pro upgrades work?
Every new case permanently increases the value of the library, so the price gradually increases over time.
Each major version includes all future cases released within that version.
Each major version is expected to grow to around 100 cases before the next major version begins.
If you own a previous major version, you receive upgrade credit equal to the final purchase price of that version.
Example:
- You purchased v1 for $29.
- v1 eventually grows to around 100 cases, and its final purchase price becomes $100.
- v2 launches at $101.
Your upgrade credit is $100, so upgrading to v2 costs only $1.
Upgrade credit never expires and can be applied toward any future major version.
For example, if you own v1 and upgrade directly to v3, the final purchase price of v1 is still applied as upgrade credit toward the current price of v3.
Previous major versions are never sold again but remain permanently available to everyone who purchased them.
Buying earlier means paying less for the same version while locking in the maximum upgrade credit available for that version.
Ready to get started?
Start building your advanced security engineering knowledge base today.