geminabox (aka Gem in a Box) before 0.13.6 has XSS, as demonstrated by uploading a gem file that has a crafted gem.homepage value in its .gemspec file.
https://github.com/advisories/GHSA-98hq-3qvg-pg78
https://github.com/geminabox/geminabox/blob/master/CHANGELOG.md
https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-3325
http://baraktawily.blogspot.co.il/2017/09/gem-in-box-xss-vulenrability-cve-2017.html