Hightmortagne

**Name of the Vulnerable Software and Affected Versions** XWiki versions 15.3-rc-1 through 15.10.14 XWiki versions 16.0.0-rc-1 through 16.4.6 XWiki versions 16.5.0-rc-1 through 16.10.0-rc-1 **Description** The issue allows a user with access to pages in the XWiki space to access the XWiki.Authentication.Administration page and switch to another installed authenticator, unless an authenticator is set in xwiki.cfg. By default, only the Standard XWiki Authenticator is available, so if no authenticator extension was installed, the impact is limited. In cases where an SSO authenticator is installed and used, the worst an attacker can do is break authentication by switching back to the standard authenticator, as it's impossible to login to a user without a stored password. **Recommendations** For XWiki versions 15.3-rc-1 through 15.10.14, update to version 15.10.14 or later. For XWiki versions 16.0.0-rc-1 through 16.4.6, update to version 16.4.6 or later. For XWiki versions 16.5.0-rc-1 through 16.10.0-rc-1, update to version 16.10.0-rc-1 or later. As a temporary workaround, consider configuring an authenticator in xwiki.cfg to prevent switching to another authenticator.

**Name of the Vulnerable Software and Affected Versions** XWiki Platform versions prior to 13.6-rc-1 **Description** The issue arises from the `AbstractSxExportURLFactoryActionHandler#processSx` function not properly escaping SSX document references when serializing them on the filesystem. This allows the HTML export process to contain reference elements with filesystem syntax like "../", "./", or "/" in general, which can lead to security issues. The referenced elements are not properly escaped. **Recommendations** For versions prior to 13.6-rc-1, update to version 13.6-rc-1 to resolve the issue. As a temporary workaround, consider limiting or disabling document export to minimize the risk of exploitation. Additionally, giving script or subwiki admin rights only to trusted people and disabling HTML/PDF export can be done as a workaround until the issue is resolved.