I’m Marnick Vandecauter, a security researcher working at the model layer of AI systems. I write about refusal robustness, prompt-injection defense, and how to evaluate these systems honestly, favoring reproducible method over hot takes.
Notes from EAGxOxford 2026
Three days in Oxford talking about frontier risk, fragile funding, warning shots we ignored, and how to actually ship research.
My First Coin & Security Weekly Unlocked!
Notes on the first Security Weekly Unlocked conference, and the first challenge coin I earned.
Python for Penetration Testers: A Review
A review of Udemy's Python for Penetration Testers, and the DVWA login brute-forcer I wrote after it.
Cisco's Introduction to Cybersecurity: A Review
A review of Cisco's free Introduction to Cybersecurity course, and who it is actually for.
Learn Ethical Hacking From A-Z: A Review
Why I cannot recommend Udemy's Learn Ethical Hacking From A-Z, even at a price of zero.
One C2 Implant a Day..
A review of Udemy's Offensive Security Engineering course, and how I extended the custom C2 implant it builds.
Getting this Blog up and Running
Setting up Jekyll with a customised Chirpy theme on GitLab Pages, including the mistakes made on the way.
F[0x05] Reflected XSS in Wordpress plugin - Budyboss
F[0x05]: a reflected XSS in the BuddyBoss WordPress plugin, found while testing a non-profit's platform.