CryptoCat
@cryptocat.me
Security Researcher 😈
Hacking Content @ https://yt.cryptocat.me 💜
Hacking Content @ https://yt.cryptocat.me 💜
Pinned
CryptoCat
@cryptocat.me
· Jun 13
GitHub - Crypto-Cat/CTF: CTF chall write-ups, files, scripts etc (trying to be more organised LOL)
CTF chall write-ups, files, scripts etc (trying to be more organised LOL) - GitHub - Crypto-Cat/CTF: CTF chall write-ups, files, scripts etc (trying to be more organised LOL)
github.com
CTF resources 😺
Congratulations to Bhavya for being the first to capture all 5 flags on my @hackinghub.bsky.social challenge! 🥳🎉
We've released a small patch. If you were stuck on flag 3, please re-download files! Good time to practice your patch-diffing 👀
app.hackinghub.io/hubs/mother-...
We've released a small patch. If you were stuck on flag 3, please re-download files! Good time to practice your patch-diffing 👀
app.hackinghub.io/hubs/mother-...
November 14, 2025 at 2:03 PM
Congratulations to Bhavya for being the first to capture all 5 flags on my @hackinghub.bsky.social challenge! 🥳🎉
We've released a small patch. If you were stuck on flag 3, please re-download files! Good time to practice your patch-diffing 👀
app.hackinghub.io/hubs/mother-...
We've released a small patch. If you were stuck on flag 3, please re-download files! Good time to practice your patch-diffing 👀
app.hackinghub.io/hubs/mother-...
So, who's gonna blood my new @hackinghub.bsky.social challenge? 😼
Challenge 🔗 app.hackinghub.io/hubs/mother-...
First 3 solves will earn the "Hacker Cat" role in my discord server ➡️ discord.cryptocat.me
#ctf #capturetheflag #ethicalhacking #cybersecurity #infosec #offsec
Challenge 🔗 app.hackinghub.io/hubs/mother-...
First 3 solves will earn the "Hacker Cat" role in my discord server ➡️ discord.cryptocat.me
#ctf #capturetheflag #ethicalhacking #cybersecurity #infosec #offsec
November 13, 2025 at 2:52 PM
So, who's gonna blood my new @hackinghub.bsky.social challenge? 😼
Challenge 🔗 app.hackinghub.io/hubs/mother-...
First 3 solves will earn the "Hacker Cat" role in my discord server ➡️ discord.cryptocat.me
#ctf #capturetheflag #ethicalhacking #cybersecurity #infosec #offsec
Challenge 🔗 app.hackinghub.io/hubs/mother-...
First 3 solves will earn the "Hacker Cat" role in my discord server ➡️ discord.cryptocat.me
#ctf #capturetheflag #ethicalhacking #cybersecurity #infosec #offsec
The "Ultimate Calculator 3000" challenge is over! ⏳
You can watch the video walkthrough here ➡ youtu.be/lRJno96za5A
I'll leave everything online for another week or so 🙂
You can watch the video walkthrough here ➡ youtu.be/lRJno96za5A
I'll leave everything online for another week or so 🙂
Hidden Product Activation and Serial Keygen - "Ultimate Calculator 3000" [Rev/Web Challenge]
YouTube video by CryptoCat
youtu.be
October 30, 2025 at 2:13 PM
The "Ultimate Calculator 3000" challenge is over! ⏳
You can watch the video walkthrough here ➡ youtu.be/lRJno96za5A
I'll leave everything online for another week or so 🙂
You can watch the video walkthrough here ➡ youtu.be/lRJno96za5A
I'll leave everything online for another week or so 🙂
My writeup for the September Dojo challenge on @yeswehack.bsky.social - Chainfection ⛓
The challenge combined multiple CVEs, creating a chain of vulnerabilities: SQL injection -> file write + path traversal -> SSTI (RCE)
Read the full writeup ➡️ book.cryptocat.me/blog/ctf/mon...
The challenge combined multiple CVEs, creating a chain of vulnerabilities: SQL injection -> file write + path traversal -> SSTI (RCE)
Read the full writeup ➡️ book.cryptocat.me/blog/ctf/mon...
October 28, 2025 at 4:51 PM
My writeup for the September Dojo challenge on @yeswehack.bsky.social - Chainfection ⛓
The challenge combined multiple CVEs, creating a chain of vulnerabilities: SQL injection -> file write + path traversal -> SSTI (RCE)
Read the full writeup ➡️ book.cryptocat.me/blog/ctf/mon...
The challenge combined multiple CVEs, creating a chain of vulnerabilities: SQL injection -> file write + path traversal -> SSTI (RCE)
Read the full writeup ➡️ book.cryptocat.me/blog/ctf/mon...
I made a new CTF challenge! It will run until the 30th of October 🎃
There's no prizes, but the first 3 solves will earn themselves the "Hacker Cat" rank in my discord server 😸
Download "Ultimate Calculator 3000" to get started ➡ discord.cryptocat.me
There's no prizes, but the first 3 solves will earn themselves the "Hacker Cat" rank in my discord server 😸
Download "Ultimate Calculator 3000" to get started ➡ discord.cryptocat.me
October 22, 2025 at 10:08 AM
I made a new CTF challenge! It will run until the 30th of October 🎃
There's no prizes, but the first 3 solves will earn themselves the "Hacker Cat" rank in my discord server 😸
Download "Ultimate Calculator 3000" to get started ➡ discord.cryptocat.me
There's no prizes, but the first 3 solves will earn themselves the "Hacker Cat" rank in my discord server 😸
Download "Ultimate Calculator 3000" to get started ➡ discord.cryptocat.me
Reposted by CryptoCat
Recapping Day One of #Pwn2Own Ireland 2025. Join @dustinchilds.bsky.social (and Maude) as he covers the highlights of the first day of the competition. We awarded $522,500 for 34 unique 0-day bugs, and more is to come. youtu.be/tiM_StSFvow
Recapping Day One of Pwn2Own Ireland 2025
YouTube video by Trend Zero Day Initiative
youtu.be
October 22, 2025 at 8:15 AM
Recapping Day One of #Pwn2Own Ireland 2025. Join @dustinchilds.bsky.social (and Maude) as he covers the highlights of the first day of the competition. We awarded $522,500 for 34 unique 0-day bugs, and more is to come. youtu.be/tiM_StSFvow
Reposted by CryptoCat
We just posted our AttackerKB @rapid7.com Analysis for the recent Cisco 0day chain; CVE-2025-20362 and CVE-2025-20333. Full technical root cause analysis of both the auth bypass and buffer overflow are here: attackerkb.com/topics/Szq5u...
CVE-2025-20362 | AttackerKB
On September 25, 2025, Cisco published advisories for two new vulnerabilities, CVE-2025-20362, and CVE-2025-20333, which are known to be exploited in-the-wild …
attackerkb.com
October 6, 2025 at 8:38 AM
We just posted our AttackerKB @rapid7.com Analysis for the recent Cisco 0day chain; CVE-2025-20362 and CVE-2025-20333. Full technical root cause analysis of both the auth bypass and buffer overflow are here: attackerkb.com/topics/Szq5u...
New video looking at some interesting printer vulnerabilities, found by @stephenfewer.bsky.social (@rapid7.com) 🖨
▶ youtu.be/--SaQKmcyiU
▶ youtu.be/--SaQKmcyiU
Print Scan Hacks: Understanding the 8 CVEs Impacting Brother Printers
YouTube video by CryptoCat
youtu.be
September 25, 2025 at 1:08 PM
New video looking at some interesting printer vulnerabilities, found by @stephenfewer.bsky.social (@rapid7.com) 🖨
▶ youtu.be/--SaQKmcyiU
▶ youtu.be/--SaQKmcyiU
One week until @bsidesbelfast.bsky.social, Who's going? 👀
As always, I've got stickers - come say hi! 👋
As always, I've got stickers - come say hi! 👋
September 4, 2025 at 2:46 PM
One week until @bsidesbelfast.bsky.social, Who's going? 👀
As always, I've got stickers - come say hi! 👋
As always, I've got stickers - come say hi! 👋
Video walkthrough for the "Fancy Login Form" web challenge from the @why2025.bsky.social CTF 🚩
Learn how to exfiltrate data via CSS injection ➡️ youtu.be/jUjlj2z5jJk
Learn how to exfiltrate data via CSS injection ➡️ youtu.be/jUjlj2z5jJk
August 14, 2025 at 6:57 PM
Video walkthrough for the "Fancy Login Form" web challenge from the @why2025.bsky.social CTF 🚩
Learn how to exfiltrate data via CSS injection ➡️ youtu.be/jUjlj2z5jJk
Learn how to exfiltrate data via CSS injection ➡️ youtu.be/jUjlj2z5jJk
Played the @why2025.bsky.social CTF over the weekend 💜 Here's some web challenge writeups 👇
book.cryptocat.me/ctf-writeups...
book.cryptocat.me/ctf-writeups...
Web | CTF Writeups
book.cryptocat.me
August 12, 2025 at 3:50 PM
Played the @why2025.bsky.social CTF over the weekend 💜 Here's some web challenge writeups 👇
book.cryptocat.me/ctf-writeups...
book.cryptocat.me/ctf-writeups...
Famous beef noodle soup (broth simmering continously for over 50 years!) in one of my all time favourite cities - Bangkok! 🇹🇭 Any hackers here wanna hang out, hmu 🤙
July 1, 2025 at 7:48 AM
Famous beef noodle soup (broth simmering continously for over 50 years!) in one of my all time favourite cities - Bangkok! 🇹🇭 Any hackers here wanna hang out, hmu 🤙
I've done a lot of awesome hacker meetups but this one was next level! So nice to meet brutecat, dreyand and IDlSSEVERYTHING🔥 These guys have some crazy skills (and stories), hope to meet again in the future 💜
June 28, 2025 at 9:34 AM
I've done a lot of awesome hacker meetups but this one was next level! So nice to meet brutecat, dreyand and IDlSSEVERYTHING🔥 These guys have some crazy skills (and stories), hope to meet again in the future 💜
I'll be in Singapore this weekend! I know there's lots of cool hackers there so hmu if you wanna get some coffee/food/drinks 🥰
June 26, 2025 at 8:07 AM
I'll be in Singapore this weekend! I know there's lots of cool hackers there so hmu if you wanna get some coffee/food/drinks 🥰
Finally back in #KualaLumpur 🙏 Meeting some of my favourite Malaysian hackers for food/drinks tomorrow night. If you wanna join, let me know! 🥰
June 12, 2025 at 3:56 PM
Finally back in #KualaLumpur 🙏 Meeting some of my favourite Malaysian hackers for food/drinks tomorrow night. If you wanna join, let me know! 🥰
Reposted by CryptoCat
Here is the official writeup of my XSS challenge on Intigriti. I think it contains some fun browser trivia even for those who did not look at the chall
joaxcar.com/blog/2025/05...
joaxcar.com/blog/2025/05...
Confetti: Solution to my Intigriti May 2025 XSS Challenge - Johan Carlsson
joaxcar.com
May 20, 2025 at 3:59 PM
Here is the official writeup of my XSS challenge on Intigriti. I think it contains some fun browser trivia even for those who did not look at the chall
joaxcar.com/blog/2025/05...
joaxcar.com/blog/2025/05...
Reposted by CryptoCat
The legendary @joaxcar.bsky.social made a really interesting XSS challenge this month for Intigriti. My solution involved winning a race condition with 100