SiYuan: Cross-boundary content disclosure via getBacklinkDoc/getBackmentionDoc (publish mode): reader-reachable rendered DOM of publish-forbidden docs; sibling list endpoints are filtered

CVE: This vulnerability corresponds to CVE-2026-68586. Summary The backlink API splits into list endpoints which documents reference a block and content endpoints the rendered text of those referencing blocks. The list endpoints apply a publish-access filter, the content endpoints do not. As a...