XWiki Platform is a generic wiki platform. Starting in version 11.6-rc-1, comments are supposed to be executed with the right of superadmin but in restricted mode (anything dangerous is disabled), but the async macro does not take into account the restricted mode. This means that any user with comment right can use the async macro to make it execute any wiki content with the right of superadmin. This has been patched in XWiki 14.9, 14.4.6, and 13.10.10. The only known workaround consists of applying a patch and rebuilding and redeploying org.xwiki.platform:xwiki-platform-rendering-async-macro.

Impact A user disabled on a wiki using email verification for registration can re-activate himself by using the activation link provided for his registration.

Patches The problem has been patched in the following versions of XWiki: 11.10.13, 12.6.7, 12.10.2, 13.0.

Workarounds It's possible to workaround the issue by resetting the validkey property of the disabled XWiki users. This can be done by editing the user profile with object editor.

References https://jira.xwiki.org/browse/XWIKI-17942

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