fhs.cuni.cz XSS vulnerability

Vulnerable URL: https://fhs.cuni.cz/files/svcore/full.html?bg=xss"=%2FFHSENG-600-version1-galleryA35faecd7dc7148b8ba4b03510c294f8e.xml=%2F=%2Fimages%2F=%2Fthumbs%2F=true=true=false=true=true=false=%23fff=%23fff=true=-1 Details: Description| Value ---|--- Patched:| Yes, at 16.09.2017 Latest check...