peterjson @peterjson
Offensive Security Engineer at @calif_io Vietnam Joined February 2018-
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Early this week, we had a meeting at Apple Park in Cupertino. While there, we also shared with Apple our latest vulnerability research report: the first public macOS kernel memory corruption exploit on M5 silicon, surviving MIE. It was laser printed, in honor of our hacker friends. Full story: open.substack.com/pub/calif/p/fi…
MAD Bugs: Claude Wrote a Full FreeBSD Remote Kernel RCE with Root Shell (CVE-2026-4747) To our knowledge, this is the first remote kernel exploit both discovered and exploited by an AI. blog.calif.io/p/mad-bugs-cla…
We have some exciting news to share: @blacktop__ is joining Calif to work on a range of R&D projects focused on Apple and AI security. If you work in the Apple security ecosystem, he’s already a household name. He’s the creator of: * ipsw – the ubiquitous Apple firmware analysis tool: github.com/blacktop/ipsw * darwin-xnu-build – reproducible XNU kernel builds: github.com/blacktop/darwi… * ipsw-diffs – automated diffing of Apple releases: github.com/blacktop/ipsw-… * The only public deep-dive on Apple’s Lockdown Mode: github.com/blacktop/prese… His tooling is so good that even Apple engineers use it. If you do reverse engineering, chances are you’ve touched his Rust headless IDA MCP server: github.com/blacktop/ida-m…. People have literally collected CVEs and bug bounties just by digging through the diffs produced by his tools. With @brucedang, @Little_34306 and now @blacktop__, we're building a serious Apple security force at Calif. We’ll have more announcements in this space soon! If you're interested in Apple security, AI, automated bug discovery, reverse engineering, or hacking, we’re hiring: calif.io/jobs.
A Race Within A Race: Exploiting CVE-2025-38617 in Linux Packet Sockets. A step-by-step guide to exploiting a 20-year-old bug in the Linux kernel to achieve full privilege escalation and container escape, plus a cool bug-hunting heuristic. open.substack.com/pub/calif/p/a-…
We hacked the AWS JavaScript SDK, a core library powering the entire @awscloud ecosystem - including the AWS Console itself 🤯 How did we do it? Just two missing characters was all it took. This is the story of #CodeBreach 🧵👇
“Vibe Hacking”: Abusing Developer Trust in Cursor and VS Code Remote Development blog.calif.io/p/vibe-hacking…
If you can motivate yourself to spend 8+ hours a day, 5 days a week to read through: - Atlassian - Jira - Slack - GitHub - Other internal SaaS applications without guaranteed results, you'll be an amazing red teamer.
Submitted this bug to ZDI a long time ago, but they weren’t interested 🥲. Later sent to Oracle, marked dup of CVE-2023-22047. CVSS 7.5 but leads to unauth RCE. Fortunately, some big programs accepted it. Check exploit here : github.com/tuo4n8/CVE-202… #BugBounty #InfoSec #Oracle
@tuo4n8 it's time to collect some 💸, great work btw 👏
Wormable Substack XSS: blog.calif.io/p/wormable-sub… It must have been years since the last time a wormable XSS was found in a major social media website. This beautiful type confusion XSS attack vector is a gift that keeps on giving. But most of all, @samykamkar is our hero!
Type confusion attacks in ProseMirror editors blog.calif.io/p/type-confusi…
Type confusion attacks in ProseMirror editors blog.calif.io/p/type-confusi…
New blog post: in a recent engagement, we turned a simple XSRF in Argo CD to a shell with cluster admin privileges. No fix is available. We recommend hosting Argo CD on an isolated domain. Details: blog.calif.io/p/argo-cd-csrf
CVE-2023-49105 WebDAV Api Authentication Bypass using Pre-Signed URLs POC Lazy coder + ChatGPT => nocode cc @vigov5 github.com/0xfed/ownedclo…
If you use cert-manager.io in AWS EKS, be aware of a privesc vector that leads to full cluster compromise. We recommend revoking pod creation permission and switching to domain verification using DNS. See the update at the end of this blog post: blog.calif.io/p/privilege-es…
Calif Inc: Privilege escalation in AWS Elastic Kubernetes Service blog.calif.io/p/privilege-es…
Pretty cool testimonial from @AnthropicAI. If you're into hacking AI models, we're hiring! docs.google.com/document/d/1SJ…
@testanull @Hu3skyS Better luck next time 🤣
In a recent engagement, we encountered a target running CraftCMS, and discovered a Remote Code Execution vulnerability that allowed us to compromise the target. blog.calif.io/p/craftcms-rce CC @yeuchimse
shubs @infosec_au
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Pham Khanh @rskvp93
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ϻг_ϻε @steventseeley
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pyn3rd @pyn3rd
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Joseph Thacker @rez0__
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frycos @frycos
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Bien 🇻🇳 @bienpnn
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LamScun @LamScun
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Soroush Dalili @irsdl
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Nguyen The Duc @ducnt_
3K Followers 392 Following Just another web warrior ⚔️ Security Researcher ۞ Principal Security Engineer @Verichains ۞ Pwn2Own 2023 ۞@vnsec squad ۞ 💰https://t.co/wuyz6IfAbA ۞ nano 💻
Md Ismail Šojal �... @0x0SojalSec
45K Followers 5K Following Cyber_Security_Re-searcher || Ai Re-searcher || AI-Sec|| Malware Analysis II iOS || Pwn || 0SINT || Project AI-StrikeSec || 0ldAccounts Suspended @0xSojalSec ||
Nguyen Xuan Hoang @hoangnx99
702 Followers 130 Following Security Researcher at @vcslab Chief Finance Officer of @u0Kplusplus
🇸🇦 Murtada Bin ... @0x_rood
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Alvaro Muñoz @pwntester
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Alex Matrosov @matrosov
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Swing @bestswngs
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Ashu (有关必回�... @Sec_211
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kernullist @kernullist
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No @backyard0810
0 Followers 39 Following
AbuMuslim (أبومُ... @m19o__
10K Followers 3K Following Security Philosopher, Organizer @BSides_ABQ, Board Member @OWASPEgypt. R&D @aivillage_dc. YT @CyberDose_ Coffee++
Toan Pham @__suto
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say2 @say___2
653 Followers 279 Following SeHee Kim / iOS / Browser (safari/chrome sbx) / VR @dfsec_com 💪 / keep integrity
Griffendor @Griffend0R
0 Followers 203 Following
xsser @xsser_w
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Faroz @farozz__
0 Followers 85 Following
JK JK @jk090263
1 Followers 305 Following
mikecotic @mikecotic
252 Followers 2K Following
Leon @caothudanhgiay
87 Followers 468 Following I’m not a good developer I just have one surprising skill that makes me incredibly effective My secret? I read docs.
_ZN4DionC1Ev @justdionysus
5K Followers 1K Following I write software and drive around Baltimore looking for stuff to do.
Quang Ha @r3st1231
0 Followers 29 Following
jaybird1291 @jaybird1291
260 Followers 581 Following Cybersecurity student at École2600 🇫🇷 - Focused on DFIR and Apple systems security - Learning Japanese on my own/日本語は独学で学んでいて、まだまだ初心者なので、間違いがあればご容赦ください🙇🏻♂️
annihilated_mollusk @AnnihilatedM
42 Followers 1K Following
mrch @mrchkz
1 Followers 159 Following
Ongia Noel @NoelOngia8195
0 Followers 101 Following
null sec @bynullsec
0 Followers 66 Following
sudi @sudhanshur705
6K Followers 801 Following If there's non zero chance, the effort is infinite, anything is possible
VietIfy IT Services @vietifysm
598 Followers 1K Following IT Services Đà Nẵng | Website • Phần mềm • An ninh mạng • Hỗ trợ CNTT 5 lần IT Audit MIỄN PHÍ cho doanh nghiệp Đà Nẵng DM "AUDIT" để nhận ngay 💻🌊 #DaNangI
Chris Isaias @_call_gate
145 Followers 3K Following Penetration Testing & Reverse Engineering. . . Phd(c), Msc (RHL), NATO, ESDC & RIPE fellow, IEEE snr, FIRST liaison, CISSP, CRTO, PNPT
kabuto-png @KabutoPng
0 Followers 156 Following
Trần Gia Nghĩa @th3_bl1nd3r
13 Followers 368 Following
vodanh @vodanh193
0 Followers 203 Following
Dq Hung @DqHung6
7 Followers 578 Following
Nguyen Huu Dat @r0ss0n3r1x
8 Followers 302 Following There’s no elevator to success. You have to take the stairs.
cmx @Clim4xog
42 Followers 859 Following
cmdexploit @cmdexploit
2 Followers 179 Following
hypr @hyprdude
3K Followers 857 Following vuln research+exploit dev | pwn2own {'24, '25}, Master of Pwn '25 | bordeaux enjoyer | friend of all cats | @SummoningTeam
Hao Tran (noah) @TranLyNhatHao
19 Followers 663 Following Working on blockchain security & program analysis Security Researcher at @cyberjutsu_io
fumo @nuts_727
0 Followers 22 Following
Nguyen Minh Tien @tiennmbk
1 Followers 145 Following
L4ys @_L4ys
4K Followers 1K Following Co-Founder of @TrapaSecurity and @PwnableTW MSRC Top 100 / ZDI Platinum Hunting bugs for fun
Thinkst Canary @ThinkstCanary
13K Followers 11K Following Most companies only realise they are breached when informed by a 3rd party. This is a stupid problem! Thinkst Canary. Know. When it Matters.
Intigriti @intigriti
210K Followers 667 Following Bug bounty & VDP platform trusted by the world’s largest organisations! 🌍
TrendAI Zero Day Init... @thezdi
89K Followers 16 Following TrendAI Zero Day Initiative™ (ZDI) is a program designed to reward security researchers for responsibly disclosing vulnerabilities.
Sam Curry @samwcyo
101K Followers 1K Following
shubs @infosec_au
58K Followers 2K Following Co-founder, security researcher. Building an attack surface management platform, @assetnote
Ben Sadeghipour @NahamSec
248K Followers 1K Following Cofounder @hackinghub_io | Advisor @CaidoIO. I hack companies and make content about it. #NahamCon organizer. ex @hacker0x01🇮🇷
Julien | MrTuxracer �... @MrTuxracer
39K Followers 443 Following Founder of @rcesecurity | #BugBounty | @Hacker0x01 MVH && H1-Elite | $1,5+ Mio in Bounties | Mobile Hacker | @[email protected]
Pham Khanh @rskvp93
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chompie @chompie1337
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payloadartist @payloadartist
46K Followers 291 Following I discuss AI, Cybersecurity & Hacking • Helped secure organizations like Google • Opinions are my cat's • Part-time shitposter
ϻг_ϻε @steventseeley
23K Followers 557 Following Artist disguised as a logician. Pwn2Own Winner. Spiritual Alchemy. An adept in the making.
cts🌸 @gf_256
67K Followers 983 Following founder and hacker @zellic_io @v12sec @pb_ctf yt https://t.co/nlNai6iQCn
Gareth Heyes \u2028 @garethheyes
38K Followers 1K Following Web security researcher at PortSwigger. Author of JS for Hackers and Hackvertor. https://t.co/e0aNEbFb9D
bugcrowd @Bugcrowd
199K Followers 6K Following The leading provider of crowdsourced cybersecurity solutions purpose-built to secure the digitally connected world...Unleash Ingenuity™
James Kettle @albinowax
84K Followers 102 Following Director of Research at @PortSwigger aka @Burp_Suite. Find my research, tools & contact details at https://t.co/vP6UbGmvl3
pyn3rd @pyn3rd
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Nate @nnwakelam
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starlabs @starlabs_sg
10K Followers 18 Following A Singapore company that discovers vulnerabilities to help customers mitigate the risks of cyber attacks. Organisers of @offbyoneconf
Joseph Thacker @rez0__
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Alex Matrosov @matrosov
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kernullist @kernullist
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chrisrohlf @chrisrohlf
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Security Bug Aggregat... @BugsAggregator
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_ZN4DionC1Ev @justdionysus
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Elias Bachaalany @eliasbchlny
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Juliano Rizzo @julianor
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Mitchell Hashimoto @mitchellh
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Ariel @0xArielK
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NiNi @terrynini38514
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Nebula Security @nebusecurity
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skull @brutecat
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Stefan Esser @i0n1c
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Ben Ethington 🛠️ @XerzesX
489 Followers 1K Following Building AI-powered reverse engineering tools with Claude & Ghidra. Diablo 2 archaeologist with 154K+ mapped functions. Dad x10. 🛠️
allthingsida @allthingsida
5K Followers 407 Following All things IDA, security, reverse engineering, programming, AI and more. Friend and fan of Hex-Rays but non-official.
𝙁 𝙀 𝙇 𝙄 �... @felixm_pw
1K Followers 488 Following Lead Developer at https://t.co/lX5jH9MbhI (@ct_tool)
Giuseppe `N3mes1s` @N3mes1s
13K Followers 327 Following windows, macos, linux, android && lowlevel && ring-1 lover; EDR chef; malware hunter; purple team💜
Gi7w0rm @Gi7w0rm
19K Followers 819 Following Threat Intelligence Analyst | Projects: https://t.co/azRpNg9NJQ & https://t.co/SyvUfXpbmI | If I post false intel, contact me! Support me: https://t.co/5WgDqr0K8p 🇪🇺🇩🇪🇺🇦🌈
Defused @DefusedCyber
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Tim Blazytko @mr_phrazer
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Chaofan Shou @Fried_rice
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V4bel @v4bel
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Nicolas Chatelain @Nicocha30
418 Followers 310 Following Security researcher | Ligolo/Ligolo-ng/Chashell author
Arnold Osipov @osipov_ar
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Michael.Gorelik @smgoreli
1K Followers 321 Following CTO at Morphisec, CISSP, GitHub - https://t.co/JlYOhDEG5c
Init1Security @init1security
521 Followers 65 Following Elevating security with expert offensive strategies
DirectoryRanger @DirectoryRanger
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%TEMP% @TEMP43487580
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Steve Borosh @rvrsh3ll
1K Followers 732 Following The future is not set. There is no fate, but what we make for ourselves. - John Connor
Atredis Partners @Atredis
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Moritz @m_r_tz
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Willi Ballenthin @williballenthin
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Dennis Kniep @dennis_kniep
251 Followers 241 Following
MalDev Academy @MalDevAcademy
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Thinkst Canary @ThinkstCanary
13K Followers 11K Following Most companies only realise they are breached when informed by a 3rd party. This is a stupid problem! Thinkst Canary. Know. When it Matters.


































