CTFs
ZimziCTFs, xoxo
| Platform |  | Pricing | Only free issues | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 25 | Founded | 3 years ago | Last Issue | a year ago |
| Active | |||||
Read this Newsletter
zimzi.substack.comLatest Issues
Jitsi privacy flaw that enables one-click stealth audio and video capture
Jitsi is an open-source web conferencing application. Jitsi also hosts a public instance, with millions of monthly active users.
Attack scenario
Let’s walk through an example. An attacker runs a meeting called MiniGinger on the publi...
Midnight Sun CTF 2025 Quals - Hackchan
Overview
The task includes:
-
a source code,
-
a web page.
Let's take an overview of the webpage functionalities:
-
registration/login:
-
welcome page:
-
shop, with a possibility to:
-
add products:
-
ch...
-
Intigriti's January Challenge - TrustFoundry
A link to the task.
Author: Godson
Overview
When we click the link, we can see the webpage with a one field form and colorful particles. We don’t have access to the server source code, only to the client-side code.
The frontend code i...
IrisCTF 2025: webwebhookhook
Author: sera
Links with source code: ctf-webpage or IrisCTF GitHub
Overview
The app that allows:
- registering new hooks with their template and responses:
fragment of MainController.kt
@PostMapping("/create", consu...
Hack.lu CTF 2024 Workout Planner
I've recently been playing with some other teams, and not as Zimzi. I solved this task with three other people and it was awesome to work together! This September they also organized an onsite CTF, so if they do it again I highly recommend...
Audience Metrics
Subscribers, engagement, traffic and sponsorship for CTFs.
| Subscribers | Monthly Web Visits | Accepts Sponsors | |||
|---|---|---|---|---|---|
| Estimated Cost per Ad | |||||
Explore More
Authors
The writers behind this newsletter.
hacking | CTFs | web
Frequently Asked Questions
How can I access the email archive for CTFs?
You can find recent issues that have been published by CTFs on Reletter by scrolling up to where it says Latest Issues. Tap on the link for any of the most recent emails or hit More Issues to see older ones.
How many subscribers does CTFs have?
To see how many people subscribe to CTFs, simply upgrade your Reletter account. We provide readership numbers and lots of other stats for this newsletter so you can decide if it's worth reaching out to.
How can I advertise in CTFs?
Newsletter advertising can be extremely effective when it's done right. Before you pitch CTFs as a potential sponsor or partner, make sure that you've done your research and checked its newsletter stats with Reletter.
Then, personalize one of our winning pitching templates and send it to the right person using the contact info provided.
How much does it cost to sponsor a publication like CTFs?
Newsletter ad rates (or CPM) vary depending on many factors, including industry, number of subscribers, open rate, ad placement and more.
To find out how much an ad will cost, contact CTFs using the contact information provided and ask for a copy of their media kit.
How can I find newsletters related to CTFs?
Scroll up to where it says Related Newsletters to see other publications like CTFs. You can also search our email newsletter directory to discover other newsletters that cover the topics you're interested in.
How do I contact CTFs?
Reletter provides this newsletter's website URL above, where you will often find their contact information. We also provide links to associated social media accounts and pitching templates so you can reach out fast.