XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. The `modifications` rest endpoint does not filter out entries according to the user's rights. Therefore, information hidden from unauthorized users are exposed though the `modifications` rest endpoint (comments and page names etc). Users should upgrade to XWiki 14.6+, 14.4.3+, or 13.10.8+. Older versions have not been patched. There are no known workarounds.
https://jira.xwiki.org/browse/XWIKI-19997
https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-p88w-fhxw-xvcc
https://github.com/xwiki/xwiki-platform/commit/38dc1aa1a4435f24d58f5b8e4566cbcb0971f8ff