Stored XSS Found

How it was found

The type of XSS Vulnerability I found on your website is a stored xss. after i connect my github account and add a new integration then i chose my repositories then on the right side of that is a textfield that has a placeholder of Branches (optional). then i put the following code on that textfield "><img src=x onerror=alert(document.domain);> then i click save integration button. then after that an alert box popup containing the domain of the site.