Pinned Tweet
Found a full-blown CSP bypass on the current version of Firefox (69). Not working on the beta version. PoC: abrasax.club/?payload=<object data="javascript:alert(1)"></object>

#bugbounty
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Matheus Vrech retweeted
‿⊱⊱༒༻༻༻༻⛧༺༺༺༺༒⊰⊰
‿︵‧˚⊹ CHAMADA DE ARTIGOS ⊹˚‧︵‿
‿⊱⊱༒༻༻༻༻⛧༺༺༺༺༒⊰⊰
༺༻༺༻ DATA FINAL ༺༻༺༻
༺༻༺༻ 13/11 ༺༻༺༻
༺༻༺ trm@tramoia.sh ༻༺༻
‿⊱⊱༒༻༻༻༻⛧༺༺༺༺༒⊰⊰
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Matheus Vrech retweeted
Saiu o Elytron Talks #02!

Fui o host do papo com o @0xTeles e o fepame sobre como o Bug Bounty cria profissionais pra ataques reais. 👇

youtube.com/watch?v=bnv2UR…
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Matheus Vrech retweeted
Replying to @r3tr074
As a bonus, I also wrote a small variation of the exploit overwriting /etc/passwd instead of a suid binary, making systems that have suid binaries without read perm vulnerable :P
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Matheus Vrech retweeted
I wrote a blog post about the recent copy(dot)fail bug, trying to explain some general concepts that I think were glossed over in the official article by @theori_io.
retr0.zip/blog/cve-2026-…
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Matheus Vrech retweeted
Next.js v16.2.5 fixes a bunch of vulnerabilities reported by @HacktronAI.

Patch ASAP, especially if you’re running self-hosted Next.js that SSRF might affect you

CVE-2026-44574: Middleware / Proxy bypass via dynamic route parameter injection
CVE-2026-44578: SSRF in applications using WebSocket upgrades
CVE-2026-44581: XSS in App Router applications using CSP nonces
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Matheus Vrech retweeted
Historias que seu avo nunca lhe contou sobre firebase - @vrechson & @Highustavo
Imagens sao dificeis - Thumbor 0days - @caioluders
SunCodeQL - Resolvendo a Complexidade do Frontend com SAST - m4z4r0p3
m4qu1n4 d0 mund0.ANS - gld
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Matheus Vrech retweeted
🚨: This is Tatiana Sampaio, a Brazilian scientist who restored movement in six paraplegic patients.
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Matheus Vrech retweeted
We found a RCE in Google's AI code editor Antigravity - $10000 Bounty

Link to the blog in comments:
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Matheus Vrech retweeted
I began looking into browser security issues again in 2026 and while reviewing extension permission APIs, I noticed that the default declarativeNetRequest API (which only requires permission to block content on all pages) can be leveraged into a side-channel attack.

This wing an extension to infer the full URL of open tabs without requesting the chrome.tabs permission, and it can also leak the full URL of cross-origin redirects.

Unfortunately, fixing this issue has been deemed unrealistic by Chrome, and the risk has been accepted, so it is worth keeping this in mind when granting content-blocking permissions to browser extensions.

The complete public report can be found at issues.chromium.org/issues/4792584….
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Matheus Vrech retweeted
Leaking FXAuth Token leading to account takeover ($65,000)
ysamm.com/uncategorized/…
Instagram account takeover via Facebook Pixel script abuse ($32,500)
ysamm.com/uncategorized/…
Multiple XS-leaks disclosing Facebook users in third-party websites ($8,400)
ysamm.com/uncategorized/…
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Matheus Vrech retweeted
🟥 Positive Hack Talks → São Paulo 🇧🇷
Dec 10th, 2025

🗣️ Speakers — submit papers (flights/hotel covered). CFP link in thread 👇
💻 Cybersecurity community — join our most community-driven event.

➡️ phtalks.ptsecurity.com/saopaulo
Free · 8 talks · limited spots

#PHTalks
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Matheus Vrech retweeted
🚨 CFP aberto — Bug Bounty Village @ H2HC 2025 🚨
Achou um bug insano, bypass criativo ou tem case real de pentest/bug bounty?
Manda sua talk!
👉 docs.google.com/forms/d/e/1FAI…

#H2HC #BugBounty #Call4Papers #HackerCulture
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Matheus Vrech retweeted
Replying to @S1r1u5_
The future looks wild. We’re just getting started 🚀

Personally, I’m grateful to be building this with the greatest team @zeyu1337 @rootxharsh @LiveOverflow @haqpl, @ungrad_engineer, and @ElectrovoltSec team .

Read the full blog here: hacktron.ai/blog/introduci…
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Matheus Vrech retweeted
Securing @gumroad with Hacktron AI

Three months ago, Hacktron was still early. @HacktronAI and @rootxharsh were finding 0-days targeting specific vulnerabilities on OSS software.

Then we ran a full pentest-style scan on a big open-source project. The results were insane. 🧵
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Nice to meet with such brilliant team!
Team Hacktron at @defcon! It was great to meet many of you and talk about the future of AI-powered security.
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Matheus Vrech retweeted
We tested a pre-release version of o3 and found that it frequently fabricates actions it never took, and then elaborately justifies these actions when confronted.

We were surprised, so we dug deeper 🔎🧵(1/)

x.com/OpenAI/status/…
OpenAI o3 and o4-mini

openai.com/live/
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Matheus Vrech retweeted
Brazil made history last weekend, and of course, ELT was a part of it!

Thanks @GaneshICMC , @boitatech , @gris_ufrj and #hawksec_unifei for partnership! We got 17th place, the best brazilian result, at #DEFCONCTF Quals as "pwn de queijo"!

Thanks @hackaflag for hosting us!
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Matheus Vrech retweeted
#genuary7 #genuary2025 Use software that is not intended to create art or images.

youtube.com/watch?v=lTuvI9…
Bad apple but its HTTP in Burp Suite
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Matheus Vrech retweeted
Seeing paulosyibelo.com/2024/12/double… in PortSwigger's top 10 made me remember a trick I found a few years ago, where if a button has an ID attribute, you can trick users into submitting it by holding enter (or space).

Guess lots of places are affected 😅

PoC: lbherrera.me
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Matheus Vrech retweeted
We're thrilled to share that we'll be joining @h2hconference this December in Brazil, and we want YOU to be a part of it! 🎉

Our Call for Papers is officially open!
sessionize.com/rtv-hackers-2-…

We can't wait to see what you've got and to connect with all of you in person. See you ble time! 🙌✨ #H2HConference
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