XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. A user able to attach a file to a page can post a malformed TAR file by manipulating file modification times headers, which when parsed by Tika, could cause a denial of service issue via CPU consumption. This vulnerability has been patched in XWiki 14.10.18, 15.5.3 and 15.8 RC1.
https://jira.xwiki.org/browse/XCOMMONS-2796
https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-8959-rfxh-r4j4