GHSA-53FP-9JMV-227G SiYuan: Outline state for any document, including documents forbidden to readers, is returned by /api/storage/getOutlineStorage with no access check

Summary /api/storage/getOutlineStorage is registered with CheckAuth only and performs no authorization of any kind. Given a document identifier it returns that document's stored outline state, regardless of the document's publish tier. The two write endpoints for the same data, setOutlineStorage...