GHSA-r279-47wg-chpr

### Impact Any user with script rights can perform arbitrary remote code execution by adding instances of `XWiki.ConfigurableClass` to any page. This compromises the confidentiality, integrity and availability of the whole XWiki installation. To reproduce on a instance, as a user with script rights, edit your user profile and add an object of type `XWiki.ConfigurableClass` ("Custom configurable sections"). Set "Display in section" and "Display in category" to `other`, "Scope" to `Wiki and all spaces` and "Heading" to: ``` #set($codeToExecute = 'Test') #set($codeToExecuteResult = '{{async}}{{groovy}}services.logging.getLogger("attacker").error("Attack from Heading succeeded!"){{/groovy}}{{/async}}') ``` Save the page and view it, then add `?sheet=XWiki.AdminSheet&viewer=content&section=other` to the URL. If the logs contain "attacker - Attack from Heading succeeded!", then the instance is vulnerable. ### Patches This has been patched in XWiki 15.10.9 and 16.3.0. ### Workarounds We're not aware of any workaround except upgrading. ### References * https://jira.xwiki.org/browse/XWIKI-21207 * https://github.com/xwiki/xwiki-platform/commit/8493435ff9606905a2d913607d6c79862d0c168d ### For more information If 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:[email protected])