The Mocca Calendar application before 2.15 for XWiki allows XSS via the background or text color field.
https://github.com/xwikisas/application-mocca-calendar/security/advisories/GHSA-jvq4-j2qw-q7x2
https://github.com/xwikisas/application-mocca-calendar
https://github.com/xwiki-contrib/application-mocca-calendar
https://extensions.xwiki.org/xwiki/bin/view/Extension/MoccaCalendar