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Vulnerable U

Infosec's favorite weekly newsletter for news, tools, and tips with 30,000+ CISOs, founders, change-makers, and straight up hackers.

Written by

Matt Johansen

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🎓️ Vulnerable U | #188

Oct 2, 2026

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8 min read

🎓️ Vulnerable U | #188

Major Citrix vuln and exploitation, ShinyHunters member arrested, Massive list of new Linux Kernel CVEs, and much more!

Newsletter

🎓️ Vulnerable U | #187

Sep 25, 2026

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9 min read

🎓️ Vulnerable U | #187

FBI hacked, OpenAI hacked ...sorta, ClickFix is everywhere, 0days exploited fast, and more!

Matt Johansen

Newsletter

🎓️ Vulnerable U | #186

Sep 18, 2026

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8 min read

🎓️ Vulnerable U | #186

ChatGPTs aren't private, Flock reverse engineered, Actively exploited 0days, Passkey phishing lures, and more!

Matt Johansen

Archive

🎓️ Vulnerable U | #188

Oct 2, 2026

•

8 min read

🎓️ Vulnerable U | #188

Major Citrix vuln and exploitation, ShinyHunters member arrested, Massive list of new Linux Kernel CVEs, and much more!

Newsletter

🎓️ Vulnerable U | #187

Sep 25, 2026

•

9 min read

🎓️ Vulnerable U | #187

FBI hacked, OpenAI hacked ...sorta, ClickFix is everywhere, 0days exploited fast, and more!

Matt Johansen

Newsletter

🎓️ Vulnerable U | #186

Sep 18, 2026

•

8 min read

🎓️ Vulnerable U | #186

ChatGPTs aren't private, Flock reverse engineered, Actively exploited 0days, Passkey phishing lures, and more!

Matt Johansen

Newsletter

🎓️ Vulnerable U | #185

Sep 11, 2026

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7 min read

🎓️ Vulnerable U | #185

AI labs are taking an official stance that there is a high probability they are going to kill us all, and I guess other cyber news...

Matt Johansen

AI

+1

The Question Nobody Can Answer Fast Enough

Sep 8, 2026

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7 min read

The Question Nobody Can Answer Fast Enough

Leveling up at the data layer is unlocking pathways for blue teamers I hadn't thought possible.

Matt Johansen

Newsletter

🎓️ Vulnerable U | #184

Sep 4, 2026

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8 min read

🎓️ Vulnerable U | #184

Massive drivers license data breach, McKesson breached by ShinyHunters, TeamPCP OSINT investigation, and much more!

Matt Johansen

Newsletter

🎓️ Vulnerable U | #183

Aug 28, 2026

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8 min read

🎓️ Vulnerable U | #183

OpenAI detailed Hugging Face report, GTA 6 leaks, Omarchy 0days, TeamPCP arrests, and much more!

Matt Johansen

Newsletter

🎓️ Vulnerable U | #182

Aug 21, 2026

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10 min read

🎓️ Vulnerable U | #182

Rust supply chain attack, Big crypto stealing browser extension campaign, AI is critical Infrastructure now, and much more!

Matt Johansen

Newsletter

🎓️ Vulnerable U | #181

Aug 14, 2026

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10 min read

🎓️ Vulnerable U | #181

Delta WiFi Hack from DEFCON, Defendant hides AI prompt in court documents, Whitehouse enables privateering hackers, and more!

Matt Johansen