Wizer CTF
Find the bug in a small web app and deliver the payload against the clock
Wizer CTF releases a new small web application challenge roughly every two weeks. Each one gives you a target app and its behaviour to study; you find the vulnerability, craft a payload, and capture the flag as fast as you can. The leaderboard ranks players by how many active challenges they solved and their average solve time.
Free · No login · Browser · Intermediate
About Wizer CTF
Challenges stay active for three months, then retire and get a write-up, so the archive doubles as a secure-coding study set. It suits web developers who want to practise thinking like an attacker against injection, access control and similar bugs.
It runs in the browser and has a Play As Guest option, so no account is needed to try it; an account puts you on the leaderboard. Wizer, a security training company, runs it and also holds occasional six-hour live events.
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