Cross-site scripting (XSS) vulnerability in opac-addbybiblionumber.pl in Koha 3.14.x before 3.14.16, 3.16.x before 3.16.12, and 3.20.x before 3.20.1 allows remote attackers to inject arbitrary web script or HTML via a crafted list name.
https://koha-community.org/security-release-koha-3-20-1/
https://koha-community.org/security-release-koha-3-16-12/
https://koha-community.org/koha-3-14-16-released/
http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=14416#c4