Find the FLAG and win Intigriti swag! 🏆

Rules:

• This challenge runs from 08/12/2025 1:00 PM until 22/12/2025, 11:59 PM UTC.
• Out of all correct submissions, we will draw six winners on Wednesday 24/12/2025:
  • Three randomly drawn correct submissions
  • Three best write-ups
• Every winner gets a €50 swag voucher for our swag shop
• The winners will be announced on our Twitter profile.
• For every 100 likes, we'll add a tip to announcement tweet.
• Join our Discord to discuss the challenge!

The solution:

• Should leverage a XSS vulnerability on the challenge page (and not on any of its subdomains).
• Shouldn't be self-XSS or related to MiTM attacks.
• Should work in the latest version of Google Chrome.
• Should not require more than 1 click from the victim.
• Should include:
• The payload(s) used
• Steps to solve (short description / bullet points)
• Should be reported on the Intigriti platform.

Get started:

1. Download the challenge source code
2. Test your payloads on the challenge page & let's pop that alert!