SiYuan: Graph endpoints omit the publish-password tier: anonymous readers receive block-level content of password-protected documents

**CVE:** This vulnerability corresponds to [CVE-2026-72804](https://nvd.nist.gov/vuln/detail/CVE-2026-72804). ### Summary `getGraph` and `getLocalGraph` filter reader sessions against the *visibility* tier only and never check the publish password. Password-protected documents are `Visible = true`, so their graph nodes survive the filter and graph nodes are block-level and carry the block's actual content. An anonymous reader who has never supplied a document's password can therefore retrieve that document's per-block content and its reference/backlink topology. Both endpoints are `CheckAuth`-only, so they are reachable by the publish `RoleReader` token and by the anonymous account when `Publish.Auth.Enable` is `false`. ### Details Both handlers filter with the invisible-tier set only: ```go publishIgnore := model.GetInvisiblePublishAccess(publishAccess) // Visible tier ONLY nodes, links = model.FilterGraphByPublishIgnore(publishIgnore, nodes, links) ``` `FilterGraphByPublishIgnore` (`kernel/model/publish_access.go:849`) drops a node only when `!CheckPathAccessableByPublishIgnore(node.Box, node.Path, publishIgnore)`. There is no password evaluation anywhere in the graph code grepping `graph.go` for `CheckPublishAuthCookie` or `password` returns nothing. Because password-protected documents are `Visible = true`, their nodes pass the filter unchanged. **The nodes carry content, not just titles.** `genTreeNodes` emits one node per block, and `nodeTitleLabel` sets `node.Title = node.Label = block.Content` (`kernel/model/graph.go:673-678`). So each surviving node exposes the block's text. This is materially broader than the by-design listing behaviour: `listDocsByPath` intentionally exposes protected document *titles* (protected means "publicly visible, password required to access"), but the graph endpoints expose per-block *content* and the full link/reference topology, which listing never does. Verified at `origin/master`: `FilterGraphByPublishIgnore` contains only the `CheckPathAccessableByPublishIgnore` call; `graph.go` contains no password check; both routes are registered `CheckAuth` without `CheckAdminRole`. ### Proof of Concept Precondition: publish mode enabled (default port 6808); anonymous when `Publish.Auth.Enable` is `false`, otherwise any publish reader account. A document is marked **protected** (visible, password set) and contains blocks with distinctive content. No password is supplied in any request below. **Targeted: one protected document's content and reference structure:** ``` POST http://127.0.0.1:6808/api/graph/getLocalGraph {"id":"<PROTECTED_DOC_ID>"} ``` Returns nodes whose `Title`/`Label` contain the protected document's per-block content, plus its links/backlinks. **Workspace-wide: every protected document:** ``` POST http://127.0.0.1:6808/api/graph/getGraph {} ``` Returns block-level nodes for every protected document in the workspace, together with the complete link graph. **Control:** requesting the same document through the normal content path returns the password placeholder confirming the password gate is enforced elsewhere and omitted here. ### Impact An anonymous reader (publish mode with auth disabled) or any publish `RoleReader` can read the block-level content of every password-protected document in the workspace, plus the full reference/backlink topology, without ever supplying a password. This defeats the publish-password control for the graph subsystem. Confidentiality-only, no modification. ### Suggested fix Extend the graph filter to evaluate the password tier in addition to visibility: in `FilterGraphByPublishIgnore`, drop a node unless the document's publish password is unset or the caller presents a valid publish-auth cookie for it (`password == "" || CheckPublishAuthCookie(...)`), matching the sibling filters that enforce both tiers. Consider also excluding block content from node `Title`/`Label` for reader sessions, so the graph conveys structure without document text. Source Code Location: https://github.com/siyuan-note/siyuan Affected Packages: - go:github.com/siyuan-note/siyuan/kernel, affected < 0.0.0-20260724091654-82e9ded423e4, patched in 0.0.0-20260724091654-82e9ded423e4 CWEs: - CWE-200: Exposure of Sensitive Information to an Unauthorized Actor - CWE-862: Missing Authorization CVSS: - Primary: score 8.6, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N - CVSS_V3: score 8.6, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N References: - https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vpjw-wf5h-cgpq - https://nvd.nist.gov/vuln/detail/CVE-2026-72804 - https://github.com/siyuan-note/siyuan/commit/82e9ded423e45eabcc96010abd30c0f96bfe0323 - https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-graph-endpoints - https://github.com/advisories/GHSA-vpjw-wf5h-cgpq