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Intigriti's 0421 XSS challenge - by @terjanq

Find a way to execute arbitrary javascript on this page and win Intigriti swag.

  • This challenge runs from April 19 until April 25th, 11:59 PM CET.
  • Out of all correct submissions, we will draw six winners on Monday, April 26th:
    • 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.
The solution...
  • Should work on the latest version of Firefox or Chrome
  • Should alert() the following flag: flag{THIS_IS_THE_FLAG}.
  • Should leverage a cross site scripting vulnerability on this page.
  • Shouldn't be self-XSS or related to MiTM attacks
  • Should not use any user interaction
  • Should be reported at