How to Retrofit Spring Security Into a Legacy Internal App When VPN Access Ends

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A software developer has published a detailed guide on adding Spring Security to an existing Java Spring Boot application that previously relied solely on VPN-based network access for protection. The article addresses a common real-world scenario where internal business tools — such as accounting systems and admin panels — must handle authentication and authorization as remote and external access needs grow. Using a demonstration financial accounting system built on Java 21 and Spring Boot 3.5, the author walks through retrofitting security onto a live, publicly accessible app with a fabricated but structurally realistic dataset. The guide deliberately recreates actual bugs encountered during a parallel work project, allowing readers to trace each flaw from cause to fix using published code on GitHub. It is aimed at beginner and mid-level developers who have basic Spring Security experience but have not yet tackled row-level or role-based data authorization.

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New C Code Scoring Tool Flags Risky Functions Using Nesting and Pointer Depth

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Modular Architecture Offers a Simpler Path to Scaling Large Next.js Apps

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How to Set Up an Isolated Cybersecurity Home Lab Using Kali Linux and Ubuntu

Security researcher Elijah Abolaji has published a step-by-step guide for building a self-contained cybersecurity home lab on a personal computer. The lab uses two virtual machines — Kali Linux as the attacker and Ubuntu Server as a deliberately vulnerable target — connected on an isolated network with no access to the internet or home Wi-Fi. The setup allows users to practice real penetration testing techniques, including scanning, exploitation, and defense, without risking harm to live systems. The guide recommends a minimum of a 4-core processor, 16GB RAM, and SSD storage, and uses VirtualBox as the virtualization platform. Abolaji stresses that all tools demonstrated are dual-use and that running them against systems without explicit authorization is illegal in most jurisdictions.

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