Hacking & IT stuff

Agartha
Joined July 2019
I resigned from Anthropic today. I spent the last three years doing pretraining research at both OpenAI and Anthropic. Neither company is acting responsibly. They are racing straight to self-improving superintelligence and gambling with our lives. More thoughts below.
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"Dad, what was it like playing CTFs before AI?"
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#ECSC2025 | 🐓 Nous y sommes ! 🇵🇱 La #TeamFrance, accompagnée des coachs de l'ANSSI, est arrivée à Varsovie, prête à relever les épreuves de l'European Cybersecurity Challenge. 📅 Au programme aujourd'hui : découverte des postes de travail des équipes et cérémonie d'ouverture.
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After 5 months of development, I'm excited to introduce Auditmapper: a Security Assessment Suite for pentesters to efficiently map, track, and visualize their environment. The official release is just a few days away, but here’s a sneak peek for now😎🙏: felixbillieres.github.io/art…
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Had an absolute blast at @_leHACK_ 2025 yesterday! So grateful to @mpgn_x64 for the incredible Active Directory exploitation workshop, focusing solely on netexec. Learned a ton of useful techniques. Part 1 of my writeup: felixbillieres.github.io/art…
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Countdown to @_leHACK_ is on! Here’s what’s in store: 🤝 Insightful chats about #BugBounty & hacking tips 🐞 Our annual #LHE with an exclusive scope (📍 Le Loft, June 28-29) 🧠 A challenge crafted by @BitK_ 🎁 Swag? Sure. Fun? Always. Meet us at #leHACK2025 - booth 41! 💥 More info 👉 yeswehack.com/page/yeswehack…
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New article with a recent find on a #BugBounty program a few months ago. Since X bans links from my blog, I had no choice but to make a copy of the post under Medium. Road to SSRF: PDF generation and filter bypass on ASP.net application medium.com/@supr4s.other/roa…
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Just got a reward for a high vulnerability submitted on @yeswehack -- Cross-site Scripting (XSS) - Reflected (CWE-79). yeswehack.com/hunters/fayred #YesWeRHackers
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PwnMe CTF qualifications are now over! Congratulations to the winning teams: 🥇 @redrocket_ctf 🥈 @FlatNetworkOrg 🥉 @malta_ctf The journey isn’t over yet, see you in France for the finals! 🇫🇷 Thanks to everyone who participated!💘
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Research into a unique 0-click deanonymization exploit targeting Signal, Discord and hundreds of platform 🧵
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🎅Join in the Root-Xmas !🎅 🎄24 days, 24 challenges! From Dec 1, discover a new challenge every day at noon. For all skill levels! 🎁Earn points for each challenge solved-the top scorers will win surprise gifts to keep the Christmas magic going! 🔔Join here: xmas.root-me.org/ #RootXmas #AdventChallenge #RootMe
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We finished 🥈at @UYBHYS’s LHE organized by @yeswehack and @Bzhunt1 Congrats to @fayred_fr for winning Best Report award and to @rayanlecat for a top🥉individual ranking and the award for the most critical bug! 💥 Thanks to the organizers, can’t wait for the next edition! 🤘
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Just got a reward for a high vulnerability submitted on @yeswehack -- Cross-site Scripting (XSS) - Stored (CWE-79). yeswehack.com/hunters/fayred #YesWeRHackers
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