XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Users are able to forge an URL with a payload allowing to inject Javascript in the page (XSS). It's possible to exploit the deletespace template to perform a XSS, e.g. by using URL such as: > xwiki/bin/deletespace/Sandbox/?xredirect=javascript:alert(document.domain). This vulnerability exists since XWiki 3.4-milestone-1. The vulnerability has been patched in XWiki 14.10.5 and 15.1-rc-1.
https://jira.xwiki.org/browse/XWIKI-20612
https://jira.xwiki.org/browse/XWIKI-20583
https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-x234-mg7q-m8g8
https://github.com/xwiki/xwiki-platform/commit/5c20ff5e3bdea50f1053fe99a27e011b8d0e4b34