Tips on Marius van der Knaap

No Accessible Vector (CTF solution)

Sat, 18 Oct 2025 00:00:00 +0000

Another day, another tester leaking something they shouldn’t. You have no chance navigating your way to the flag though: It is simply not visible for you!

Difficulty: Medium

Let’s solve the No Accessible Vector challenge using the principles we’ve just learned. Make sure you read the Capture the Flag tips first, as this article leans heavily on the first.

First, we read the description and realize that a tester built a page that we don’t have access to. We can use our first principle of using developer mistakes to theorize about the solution. One common mistake is a developer not realizing that all pages are accessible regardless of access rules. All we have to do is figure out the name of the page.

Tips for the next Mendix Capture the Flag event

Sat, 18 Oct 2025 00:00:00 +0000

After winning this year’s Mendix Capture the Flag event, many people have asked me for tips. I wrote this writeup with my insights for next Capture the Flag events. Read on to learn more!

Recap

The Capture the Flag event consisted of three difficulty levels: Pizza Mario (beginner–medium), Patient Portal (hard–insane) and Magic level challenges. In total, you had about 30 hours to complete the 26 challenges. Since we solved 24 challenges (and also ate and slept), this leaves about 20 hours of hacking, which means solving approximately one challenge every hour of hacking. Time is of the essence, and working efficiently is important.

The Ultimate Mendix Hardware Purchasing Guide

Thu, 11 Sep 2025 09:54:40 +0000

How to find the best hardware for Mendix developers

The Mendix benchmark analysis

Thu, 11 Sep 2025 09:54:00 +0000

This is an addition to the Mendix hardware survey article. For full transparency, I put the research results of the benchmark analysis in this blogpost. So anyone can double check my findings. As I don’t expect many people to read this, I’m not formatting this perfectly as I would a more public blogpost. Feel free to add your thoughts!

A note on limitations

The most powerful hardware often combines different aspects to achieve its results, so it is difficult to make conclusions on single components. If a PC performs well but has both a powerful CPU and GPU, it is hard to conclude which component contributes to its success.

The Mendix React Client Is Coming: Here’s What You Need to Know

Thu, 10 Jul 2025 00:00:00 +0000

Stay up to date on React to build future-proof applications

Everything you need to know about Git for Mendix

Thu, 09 May 2024 00:00:00 +0000

For the last decade, Mendix has relied on SVN for version control. However, with Git surpassing SVN in functionality, migrating to Git became inevitable. With all the talk about using Git with Mendix, you probably considered migrating or have done so already.

Having relied on SVN for so long, many developers became accustomed to working with SVN. Now that updating is suddenly called pulling, and committing doesn’t mean what it used to mean anymore, many developers are confused about the differences between SVN and Git.

Mastering Mendix Maps: Unlocking Lightning-Fast Performance

Thu, 19 Oct 2023 00:00:00 +0000

You probably know what a list is. But do you?

Here's 10 tips you wish you knew earlier to speed up your Mendix development

Wed, 12 Jan 2022 00:00:00 +0000

Pro tips for leveling up your development game within Mendix Studio Pro