XWiki is a generic wiki platform. In XWiki 16.10.0, required rights were introduced as a way to limit which rights a document can have. Part of the security model of required rights is that a user who doesn't have a right also cannot define that right as required right. That way, users who are editing documents on which required rights are enforced can be sure that they're not giving a right to a script or object that it didn't have before. A bug in the implementation of the enforcement of this rule means that in fact, it was possible for any user with edit right on a document to set programming right as required right. If then a user with programming right edited that document, the content of that document would gain programming right, allowing remote code execution. This thereby defeats most of the security benefits of required rights. As XWiki still performs the required rights analysis when a user edits a page even when required rights are enforced, the user with programming right

XWiki Platform Security Authorization Bridge allows users with just edit right can enforce required rights with programming right

Уязвимость пакета org.xwiki.platform:xwiki-platform-security-authorization-bridge платформы создания совместных веб-приложений XWiki Platform, позволяющая нарушителю выполнить произвольный код