Zendesk: Stored XSS on [your_zendesk].zendesk.com in Facebook Channel

I have found a stored XSS in the Facebook Channel options at https://yourzendesk.zendesk.com/agent/admin/facebook/facebookauth. The XSS is a result of improperly escaping Facebook Page names. Steps to reproduce ------------------------- 1. Create a facebook page with the following title/page name...