Blog

Mert Özen's blog posts on software development, backend, frontend, and DevOps.

Series

.NET Core Web API 36 Angular 31 JavaScript Basics 19 JavaScript Intermediate 18 JavaScript Advanced 16 TypeScript Basics 14 TypeScript Intermediate 14 TypeScript Advanced 12 Entity Framework Core 28 Dapper 16 Git & GitHub 29 Web Security (OWASP Top 10) 21 LLM Fundamentals 20 C# Fundamentals 20 Object-Oriented Programming in C# 16 C# Collections and Generics 11 LINQ 17 Asynchronous Programming in C# 17 Advanced C# 14 C# Versions 6 Solution Patterns 22 SOLID and Design Principles 12 Clean Code 13 Design Patterns 23 UML and Modeling 18 Introduction to Software Architecture 9 Clean, Onion and Hexagonal Architecture 8 Vertical Slice Architecture 6 Domain-Driven Design 12 CQRS and Event Sourcing 10 Messaging and Event-Driven Architecture 9 Modular Monolith 2 Microservices 10 UI Architecture Patterns 9 Architecture Decisions 7 System Design 15 Distributed Systems Fundamentals 11 Background Jobs and Scheduled Jobs 11 Working with Message Queues 14 Logging in .NET 10 Caching 10 Real-time Applications 9 ASP.NET Core MVC and Razor Pages 13 CI/CD Fundamentals 8 GitHub Actions 16 Jenkins 12 Web Servers and Hosting 12 Deployment Strategies 9 Kubernetes 19

2 posts found #security

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DevOps PART 08

Secrets, Variables and GITHUB_TOKEN Permissions in GitHub Actions

Secrets are defined at organization, repository and environment level, the narrowest level wins, and they are masked in logs by text matching; derived values such as base64 and fields read out of JSON are not masked. With fake secrets in act we show ::add-mask::, secrets in if conditions, variables and an empty GITHUB_TOKEN, and cover least privilege with permissions, the vulnerability-alerts scope from September 2026, and GitHub App tokens instead of PATs.

8 Nov 2026 10 min 4

DevOps PART 13

GitHub Actions Security: SHA Pinning, Lockfiles, pull_request_target and Preventing Script Injection

Pin actions to full commit SHAs and keep them current with Dependabot and lockfiles, pass untrusted values through env: instead of run:, and never run PR code in pull_request_target. The tj-actions case, zizmor and actionlint findings, gh actions-lock, real script injection output under act, checkout@v7 and the December 2, 2026 change, a safe workflow_run pattern and read-only cache tokens.

8 Nov 2026 12 min 3