ClickBank XSS

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The Web's Most Trusted Digital Marketplace vulnerable to XSS and redirect

Founded in 1998, ClickBank is a secure online retail outlet for more than 70,000 digital product vendors and 110,000 active affiliate marketers.
ClickBank makes a sale somewhere in the world every three seconds, safely processing more than 27,000 digital transactions a day. We serve more than 200 countries, and are consistently ranked as one of the most highly-trafficked sites on the web.

Found by:d3v1l
Poc:

https://www.clickbank.com/webchat/email/offline-mail.jsp?workgroup=%22%3E%3Cscript%3Ealert('XSS')%3C/script%3E