SiYuan: Cross-boundary metadata disclosure via getBlockInfo (publish mode): reader-reachable document title/root info for publish-forbidden docs; sibling getDocInfo is filtered

**CVE:** This vulnerability corresponds to [CVE-2026-68585](https://nvd.nist.gov/vuln/detail/CVE-2026-68585). ### Summary The `/api/block/getBlockInfo` endpoint returns document root metadata including the document title (`rootTitle`) for a block in a publish-forbidden document, with no publish-access check. Its sibling `/api/block/getDocInfo` applies the publish-access filter, `getBlockInfo` does not. Both are gated by `CheckAuth` only, so `getBlockInfo` is reachable by the publish `RoleReader` token and by the anonymous account when `Publish.Auth.Enable` is `false`. ### Details The list/info side of this API is filtered while the block-info twin is not the asymmetry indicates an oversight rather than intended behavior: | Endpoint | Returns | Publish-access filter | Route | |---|---|---|---| | `getDocInfo` | document info/metadata | present | `CheckAuth` | | `getBlockInfo` | `box, path, rootID, rootTitle, rootChildID, rootIcon` | none | `CheckAuth` | `getBlockInfo` takes a caller-supplied block ID, validates only its format, and returns the containing document's root metadata including `rootTitle` (the document title) with no `IsReadOnlyRoleContext` / publish-access check. Because `getDocInfo` performs the filtering for equivalent data, the boundary is clearly meant to apply here; `getBlockInfo` omits it. ### Proof of Concept Reproduced on a local instance (SiYuan running locally, publish mode enabled on port 6808, publish Basic Auth disabled). Setup: a publish-forbidden document `D` whose title is a unique marker, containing a block `BLOCKID`. **1. Mark the document publish-forbidden (admin action):** ``` POST http://127.0.0.1:6806/api/filetree/setPublishAccess Authorization: Token <admin-token> {"id":"DOC","visible":false,"password":"","disable":true} ``` **2. Disclosure: the block-info endpoint returns the forbidden doc's title (anonymous, port 6808):** ``` POST http://127.0.0.1:6808/api/block/getBlockInfo {"id":"BLOCKID"} ``` Returns HTTP 200 with `data.rootTitle` set to the publish-forbidden document's title, along with `box`, `path`, `rootID`, and `rootIcon`. This document's title is not returned by the reader-facing filtered paths. ### Impact An anonymous reader (publish mode with auth disabled) or any publish `RoleReader` can read the title and root metadata (notebook, path, root ID, icon) of a publish-forbidden document by supplying a block ID from it. This discloses the existence, title, and location of documents an administrator marked as excluded from publishing. **Precondition and scope (stated honestly):** the request requires a block ID from the target document; this endpoint does not enumerate arbitrary documents. The disclosure is limited to document metadata, title, notebook, path, root ID, icon — not the document body. Block IDs for forbidden documents are obtainable from other `CheckAuth`-only endpoints that lack the publish-access filter (reported separately). Impact is confidentiality-only, limited to metadata; no content body, no modification. Encrypted notebooks are out of scope. ### Suggested fix Apply the same publish-access check `getDocInfo` uses to `getBlockInfo` before returning root metadata, resolve the block's document and enforce `IsReadOnlyRoleContext` / the publish-access filter, consistent with the sibling endpoint.

Source published

3 Sep 2026 21:22:08 UTC

Source modified

10 Sep 2026 15:25:26 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Publisher rating · MODERATE