Web Exploitation CTF Challenges

Web exploitation is the discipline that most closely mirrors the work of an application security engineer. Targets are deliberately vulnerable web applications — custom-built for the competition or pulled from well-known public vulnerable labs — and your job is to find the flaw in how the application handles untrusted input, then turn that flaw into access you were never meant to have.

The mental model is consistent across every web challenge: input arrives, gets processed, and something about that process can be bent. A string that reaches a database query unescaped becomes SQL injection. A value reflected into a page without encoding becomes cross-site scripting. A server that fetches a URL you control becomes server-side request forgery. Learning web exploitation means learning to spot those seams and to know which tool tells you what.

Expect these challenges to punish surface-level scanning. A directory brute-force and a stock payload will get you exactly as far as they always do in a real engagement — nowhere. The scoring here rewards reading how the application behaves: noticing that a JSON field is concatenated into a shell command, or that an admin endpoint checks a cookie you can simply set yourself.