André Baptista (@0xacb) header
André Baptista (@0xacb) profile picture

Hacker grinding for L1gh7 and Fr33dφm, straight outta the cosmic realm. Co-founder @ethiack

Multiverse of Hacking
Joined April 2013
Photo by André Baptista (@0xacb)Photo by André Baptista (@0xacb)Photo by André Baptista (@0xacb)Photo by André Baptista (@0xacb)Photo by André Baptista (@0xacb)Photo by André Baptista (@0xacb)Photo by André Baptista (@0xacb)Photo by André Baptista (@0xacb)Photo by André Baptista (@0xacb)
We won the MVH title at #h1702 🔥 @NahamSec @ajxchapman
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Attackers often exploit new vulnerabilities before defenders can react, sometimes before the vulnerability even gets a public ID (a CVE). In the first half of 2026, 487 vulnerabilities were listed as exploited. For 137 of them (>25%), the exploitation record existed on or before the day the CVE was published. We built Ethiack Zero to track emerging vulnerabilities from the first public signal (a patch, a GitHub advisory, news, a blog post) and validate actual exploitability before the CVE is officially published. Check it out below👇
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Live hardware hacking is coming to @BSidesLisbon. Get ready for the @Ethiack SOHO Smashup on Friday, October 30! Inspired by Pwn2Own, we’re dropping real, aging office equipment right on the floor: • One office router • One printer The challenge: Hack them live in the lounge area in front of an audience. Get creative with your exploits, AI is fully allowed, and we are accepting any kind of vulnerability. Just visit us in the lounge to schedule your time slot. Goodies await anyone with a successful exploit. See you there 👇
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André Baptista retweeted
🚨CVE-2026-111497 (Node2Shell): a critical flaw in Google's Brotli decoder may let remote attackers execute code on servers that decompress untrusted Brotli data. Affects Node.js and Bun. Patch now: Node.js 22.23.4 / 24.22.1 / 26.12.1, Bun 1.4.4. ethiack.com/info-hub/researc…
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André Baptista retweeted
Published our high fidelity scanner for node2shell: github.com/assetnote/node2sh… Detection logic was written by @hash_kitten late last week. Open sourcing it to do public good in detecting this issue black box.
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When everything is 2shell, nothing is 2shell
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André Baptista retweeted
Attackers don’t wait for the CVE. Neither does Ethiack Zero, now live for 3 days. Here’s why we built it 👇 ethiack.com/info-hub/researc…
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André Baptista retweeted
Just published our high fidelity scanner for php2shell: github.com/assetnote/php2she… See our detection logic here: slcyber.io/research/high-fid… We've taken care in our detection logic and hope it helps defenders. Congrats to @calif_io and @lcfr_hax for the discovery.
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12 years not 12 hours btw
the internet will implode in about 12 hours from now btw
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André Baptista retweeted
Two critical RCE flaws in PHP itself: CVE-2026-109618 and CVE-2026-109619 (CVSS 9.2). Every PHP stack is in scope. Fixes ship today at 14:00 UTC. Early signal flagged by Ethiack Zero. Ethiack now identifies the PHP runtimes you expose and flags EOL ones. ethiack.com/info-hub/researc…
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André Baptista retweeted
The PHP security team is giving advance notice: Upcoming security release Wed, Oct 21st 2026, 14:00UTC, two critical vulnerabilities, both rated CVSSv4 9.2. PHP users are encouraged to prepare to update. Earlier release if details become public or active exploit evidence.
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We’re continuously reversing the emerging 0days that matter most, sometimes before they get a CVE, and publishing how fast we validate them vs how fast attackers exploit them. 👉 zero.ethiack.com
Yesterday we asked: what if you could turn back the clock? We can’t, but we can see it sooner. Ethiack Zero is live: a public record of emerging 0-days. Open feed, API, MCP and methodology. Check our numbers and tell us what’s missing. zero.ethiack.com
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André Baptista retweeted
Yesterday we asked: what if you could turn back the clock? We can’t, but we can see it sooner. Ethiack Zero is live: a public record of emerging 0-days. Open feed, API, MCP and methodology. Check our numbers and tell us what’s missing. zero.ethiack.com
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André Baptista retweeted
For a long time, the CVE publication was the starting gun. Today, exploitation often starts before that. Tomorrow, we’re sharing something with the community about that gap.
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André Baptista retweeted
Think you are the fastest hacker? Prove your skills in the CTF at @BsidesLisbon 2026 run by Ethiack For this edition, we are bringing: Speed Pwning CTF Two players go head to head. Each match presents both competitors with the same CTF challenge at the same moment. The first to submit a valid flag advances. Losers are eliminated. - 8 participants - Single-elimination bracket - 30-minute matches - No qualifiers - Brackets are drawn at random Find all the details and register below↓
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BSides Lisbon 2026 is coming, and @Ethiack is running the CTF! See you on October 29th.
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André Baptista retweeted
🇵🇹 Team Portugal em Bochum! Depois da chegada à Alemanha, hoje foi dia de registo no #ECSC2026, sessão de abertura e últimos preparativos antes do início da competição. 💻 A equipa afina os detalhes para o primeiro desafio: o Jeopardy CTF, que arranca amanhã. Go #TeamPortugal!
🤖 Made with AI
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André Baptista retweeted
In them we trust 🐟🇵🇹 @ECSC_openECSC
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André Baptista retweeted
Ethiack is running the CTF for the second year in a row at @BSidesLisbon 2026. This October 29, we're bringing a new format: Speed Pwning CTF. Two players go head to head. Each match presents both competitors with the same CTF challenge at the same moment. The first to submit a valid flag advances. Losers are eliminated. - Single-elimination bracket - 30-minute matches - 8 participants - No qualifiers — entry is by registration, first come first served - Brackets are drawn at random Rules? Simple: No AI. At all. There are three categories in play: pwn, misc and web. Players decide which category they'll play before each match through a veto process, each player can veto one category. The remaining category will dictate the challenge played by both players during the match Want to participate? Register below ↓ Participants must have a BSides Lisbon 2026 ticket to be eligible.
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