© 2026 Hashnode
A concise, step-by-step walkthrough of the Sequence TryHackMe room, showing how an XSS → CSRF → insecure file upload → exposed Docker socket chain was used to escalate from guest to root. Intended for learning and authorized testing only. Table of C...

Problem While inserting data into a PostgreSQL table, I got this error: ERROR: Key (“userId“)=(1234) already exists.duplicate key value violates unique constraint “User_pkey“ SQL state: 23505 Details: Key (“userId“)=(1234) already exists. The userId...

In Kotlin, efficiently handling collections is important when working with large datasets or performing multiple transformations. One tool Kotlin offers for these situations is sequences, which allow lazy evaluation to reduce memory usage and improve...

Understanding numerical sequences is essential in fields like mathematics, data science, and machine learning. Sequences help identify patterns, predict future data points, and uncover relationships between datasets. In this blog post, I'll guide you...
