The WikiManager REST API allows any user to create wikis
ImpactAny user can exploit the WikiManager REST API to create a new wiki, where the user could become an administrator and so performs other attacks on the farm.
Note that this REST API is not bundled in XWiki Standard by default: it needs to be installed manually through the extension manager.PatchesThe problem has been patched in versions 15.10.15, 16.4.6 and 16.10.0 of the REST module.WorkaroundsThere's no workaround other than upgrading the dependency.ReferencesJIRA ticket: https://jira.xwiki.org/browse/XWIKI-22490Commit of the fix: https://github.com/xwiki/xwiki-platform/commit/82aa670106c7f5e6238ca6ed59a52d1800e05b99For more informationIf you have any questions or comments about this advisory:Open an issue in [Jira XWiki.org](https://jira.xwiki.org/)Email us at [Security Mailing List](mailto:security@xwiki.org)AttributionYou can specify here who reported the issue.