XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. A user without script/programming right can trick a user with elevated rights to edit a content with a malicious payload using a WYSIWYG editor. The user with elevated rights is not warned beforehand that they are going to edit possibly dangerous content. The payload is executed at edit time. This vulnerability has been patched in XWiki 15.10RC1.
https://jira.xwiki.org/browse/XWIKI-21490
https://jira.xwiki.org/browse/XWIKI-21489
https://jira.xwiki.org/browse/XWIKI-21488
https://jira.xwiki.org/browse/XWIKI-21487
https://jira.xwiki.org/browse/XWIKI-21486
https://jira.xwiki.org/browse/XWIKI-21485
https://jira.xwiki.org/browse/XWIKI-21484
https://jira.xwiki.org/browse/XWIKI-21483
https://jira.xwiki.org/browse/XWIKI-21482
https://jira.xwiki.org/browse/XWIKI-21481
https://jira.xwiki.org/browse/XWIKI-21311
https://jira.xwiki.org/browse/XWIKI-20331
https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-f963-4cq8-2gw7