In this article, the author provides a detailed walkthrough of the Reactor machine, which was featured in the 11th season of the Hack The Box platform. The focus is on exploiting a critical NextJS vulnerability that gained widespread attention in late 2025. Throughout the walkthrough, the author demonstrates methods for cracking user hashes and the process of privilege escalation within the system via a forgotten debugging port. The material serves as a step-by-step guide for cybersecurity professionals looking to sharpen their skills in penetration testing and vulnerability analysis of modern web frameworks. The author emphasizes the importance of timely software updates and monitoring the configuration of debugging interfaces, which often become entry points for attackers when compromising infrastructure.
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