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

Rules:

• 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 go.intigriti.com/submit-solution