11827.digitalsports.com XSS vulnerability

Vulnerable URL: http://11827.digitalsports.com/pages/roster/?levelid=2'"--!...

Khan Academy: Stored XSS {dangerous?} https://www.khanacademy.org/coach/roster/?listId=allStudents

Hi, when you go to https://www.khanacademy.org/coach/roster/?listId=allStudents and press on add class you have the possebility to add a class obvious. when you name it " it will stay persistent. quite dangerous Best regards, Olivier Beg...