{"id":"GHSA-pm3w-vxp9-ccwc","summary":"SiYuan: Cross-boundary metadata disclosure via getBlockInfo (publish mode): reader-reachable document title/root info for publish-forbidden docs; sibling getDocInfo is filtered","details":"**CVE:** This vulnerability corresponds to [CVE-2026-68585](https://nvd.nist.gov/vuln/detail/CVE-2026-68585).\n\n### Summary\n\nThe `/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`.\n\n### Details\n\nThe list/info side of this API is filtered while the block-info twin is not the asymmetry indicates an oversight rather than intended behavior:\n\n| Endpoint | Returns | Publish-access filter | Route |\n|---|---|---|---|\n| `getDocInfo` | document info/metadata | present | `CheckAuth` |\n| `getBlockInfo` | `box, path, rootID, rootTitle, rootChildID, rootIcon` | none | `CheckAuth` |\n\n`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.\n\n### Proof of Concept\n\nReproduced 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`.\n\n**1. Mark the document publish-forbidden (admin action):**\n```\nPOST http://127.0.0.1:6806/api/filetree/setPublishAccess\nAuthorization: Token \u003cadmin-token\u003e\n{\"id\":\"DOC\",\"visible\":false,\"password\":\"\",\"disable\":true}\n```\n\n**2. Disclosure: the block-info endpoint returns the forbidden doc's title (anonymous, port 6808):**\n```\nPOST http://127.0.0.1:6808/api/block/getBlockInfo\n{\"id\":\"BLOCKID\"}\n```\nReturns 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.\n\n### Impact\n\nAn 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.\n\n**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.\n\n### Suggested fix\n\nApply 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.","aliases":["CVE-2026-68585","GO-2026-6384"],"modified":"2026-09-10T15:25:40.558418494Z","published":"2026-09-03T21:22:08Z","database_specific":{"nvd_published_at":null,"cwe_ids":["CWE-862"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-09-03T21:22:08Z"},"references":[{"type":"WEB","url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-pm3w-vxp9-ccwc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68585"},{"type":"WEB","url":"https://github.com/siyuan-note/siyuan/commit/ffde3b21eca49ae98828747ca126581a553cce8b"},{"type":"PACKAGE","url":"https://github.com/siyuan-note/siyuan"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/siyuan-before-metadata-disclosure-via-getblockinfo"}],"affected":[{"package":{"name":"github.com/siyuan-note/siyuan/kernel","ecosystem":"Go","purl":"pkg:golang/github.com/siyuan-note/siyuan/kernel"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.0.0-20260721014951-ffde3b21eca4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-pm3w-vxp9-ccwc/GHSA-pm3w-vxp9-ccwc.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N"}]}