Explore CVE-2021-44228, a vulnerability in log4j affecting almost all software under the sun.

My writeup about longtrip web challenge in WannaGame Championship CTF 2025

My writeup about CTFguideline web challenge in WannaGame Championship CTF 2025

My writeup about Trust web challenge in WannaGame Championship CTF 2025

This is a web service written in spring. Use vulnerabilities to obtain flags.

dreamschool, a school community for all schools around the world Hello! I am DreamSchool, which manages a community for all schools from elementary school to university 💙 I heard that something strange is happening on Dream University's secret bulletin board, but the board is locked, so I can't even see it as an administrator 😢 Be sure to find out what's happening at Dream University!

cat loves cats

Find vulnerabilities and earn flags. Flags /flag can be obtained by running. This issue is for experienced web hackers.

I picked up the turtle in front of my house and put it in the fishing port, but the next day I saw it and it disappeared. “The fishing port is tall... how did they get out of it?”

I ruined the sociolinguistics exam... Somebody help me!! The flag format is 4TH3N3{...} Fixed a typo in the flag.