CVE-2026-73609: SiYuan: getBookmarkLabels returns every bookmark label in the workspace to anonymous readers, with no publish-access filtering

/api/attr/getBookmarkLabels is registered with CheckAuth only and applies no filtering of any kind. It runs a scan of the entire blocks table and returns the distinct set of every bookmark label in the workspace. An anonymous reader in publish mode receives the author’s complete bookmark vocabulary, regardless of whether the bookmarked blocks live in published, hidden, password-protected or forbidden documents.

The adjacent endpoint that returns bookmarks with their blocks does filter, and does so in a way that makes the intended rule explicit: it drops a label entirely when no accessible block carries it.