x3c.tf

announcing a merger!! submit your challs @ ctf.mvm.lol join us in january @ x3c.tf

With just 2 weeks to go, we're now opening up team registration for x3CTF 2025 (feat. mvm)! We're also launching a new website with a cool new design and a bunch of useful info (such as our cool awards!). Check the link in bio!

Did you know? By participating in x3CTF this weekend you could win a signed: - iPhone - iPad - iPod - Android (for every person on team) - Thinkpad (with cat ears and socks) Devices will be filled with suspicious stuff for you to discover! see u soon nya~

we're going to be revealing the full details of a prize every day until x3CTF! the day 1 prize is this thinkpad! it comes with an SSD, cat ears, socks, and a USB-C adapter for powering the thing it's also filled with fun files & stuff more deets in the discord announcements ^_^

day 2 prize is an iphone 6! it's kind of boring we will have a more interesting prize tomorrow

day 3 prize is an ipod touch!! this ipod comes loaded with over 80 classic apps for you to play around with! which ones exactly? well, you'll have to win it to find out :P

day 4 prize is androids for every person on the team!!

and this is the final day 5 prize we're announcing! it's an ipad with over 100 apps and the coolest tweaks installed!! wanna get it? you still have time to sign up!! x3ctfs starts in 7 hours from now (6pm UTC+0)

x3CTF is on!!!

During x3CTF, I discovered an unintended solution that turned out to be a pretty cool generic technique. It allows you to detect the result of a selector during CSS Injection, bypassing any CSP restricting external requests! Check out the writeup below: jorianwoltjer.com/blog/p/ctf/x3c…

there's now a fun archive of the web design made for x3ctf! the intro/outro experiences can be replayed with scrubbing and historic data and the platform itself has emulation of the server, so you can log in as anyone, submit flags & play around have fun! x3c.tf/archive/

openECSC 2025 has begun! Come practice your hacking skills in this week-long individual cybersecurity competition, open to everyone. openec.sc

and we've given out the last prize for x3CTF 2025! Thank you for playing!