BrunnerCTF 2026
Welcome to BrunnerCTF 2026.
The entire team at Brunnerne have been cooking and baking new exciting challenges for you to try, as we've expanded from a small home-bakery startup into an international unicorn as Brunnerne Inc.™, with this year's theme: "Brunnerne goes corporate".
Whether you are a completely new CTF intern or a senior executive vice president of CTF competitions, there will be delicious challenges waiting for you. This includes our beginner-friendly category now rebranded as "Onboarding". The category features plenty of opportunities to learn the basics, and the chance to ask us for hints on Discord if you get stuck.
And although Brunnerne Inc.™ is now a global phenomenon, we promise plenty of traces of traditional Danish pastry.
━━━━━━━━━━━━━━━━ EVENT INFO ━━━━━━━━━━━━━━━━
❯ Start: 2026-08-21 14:00 CEST
❯ End: 2026-08-23 14:00 CEST
❯ Website: ctf.brunnerne.dk
❯ Discord: discord.gg/wPaa2kdM97
━━━━━━━━━━━━━━━━ SPONSORS ━━━━━━━━━━━━━━━━
Proudly sponsored by:
❯ Campfire Security ❯ ICSRange ❯ SagaLabs ❯ The LEGO Group ❯ Bankdata ❯ CyberSkills ❯ Hetzner - infrastructure
Web 2
| Challenge | Has |
|---|---|
| Fair_Gambling | files |
| Technical_Debt | files |
Pwn 6
| Challenge | Has |
|---|---|
| Brunner_Stocks | files |
| Guessing_game | files |
| HRBot | files |
| Locked_Out | files |
| Mindbreaker | files |
| Pure_Notes | files |
Reverse 7
| Challenge | Has |
|---|---|
| BrunnerCorp_Pre_Employment_Aptitude_Test | files |
| Decompile | files |
| Go_Go_Decompile | files |
| KPWhy | files |
| Lockdown_mode | files |
| Reorg | files |
| Roadmap | files |
Crypto 10
| Challenge | Has |
|---|---|
| Blackboard | files |
| Brunner_Radio | files |
| Going_Paperless | files |
| Legacy_Cipher | files |
| Secret_Storage | files |
| Shredded_recipe | files |
| Slis | files |
| TriKDF_Enterprise | files |
| Why_those_random_letters | files |
| pi_crypt_0.57 | files |
Forensics 6
| Challenge | Has |
|---|---|
| Bears | files |
| CAN_you_read_this | files |
| Company_Discount | files |
| Free_Play | files |
| Rubiks_Cube | files |
| The_Missing_Recipe | files |
Misc 8
| Challenge | Has |
|---|---|
| boot2root | files |
| Activating_Neurons | files |
| Alternative_channel | files |
| Functional_Budget | files |
| Git_gud | files |
| Half_Baked | files |
| Hidden_embeddings | files |
| Magic_or_not | files |
OSINT 6
| Challenge | Has |
|---|---|
| Business_Trip | files |
| New_product_Brun_water | files |
| The_Birthplace | files |
| The_North_Star_Metric | files |
| Trivago | files |
| Unknown_Artist | files |
Mobile 5
| Challenge | Has |
|---|---|
| CakeSearch | files |
| CleanDesk | files |
| OnePass | files |
| OneVoice | files |
| TotalReward | files |