XWiki is a generic wiki platform. In versions starting from 13.5-rc-1 to before 15.10.13, from 16.0.0-rc-1 to before 16.4.4, and from 16.5.0-rc-1 to before 16.8.0, an open redirect vulnerability in the HTML conversion request filter allows attackers to construct URLs on an XWiki instance that redirects to any URL. This issue has been patched in versions 15.10.13, 16.4.4, and 16.8.0.
https://jira.xwiki.org/browse/XWIKI-22487
https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-pjhg-9wr9-rj96
https://github.com/xwiki/xwiki-platform/commit/6dab7909f45deb00efd36a0cd47788e95ad64802