Full account takeover through referral code.

Share/Referring code parameter was an indicator to the web application that the account is a new one.

The application was redirecting me to the account after signing up if a share code is sent with the request even if the account was already existing in their system.

  • August 20,2018 — Bug reported
  • August 20,2018 — Bug triaged
  • August 22,2018 — Bounty rewarded 700$
  • August 23,2018–Report resolved



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Mostafa Mamdoh

Mostafa Mamdoh

I’m a Penetration Tester, Bug Hunter @ HackerOne