SiYuan: MCP file tool's blocklist is incomplete relative to the HTTP file API it claims to align with, exposing publish-mode passwords and other sensitive workspace files

{
  "id": "a7d8e50da3fcdded0b272ded55c53c7c7b7af9aa52f6930b6efd0161aa0a2e96",
  "url": "https://osv.dev/vulnerability/GHSA-c8r8-95hg-mp34",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "SiYuan: MCP file tool's blocklist is incomplete relative to the HTTP file API it claims to align with, exposing publish-mode passwords and other sensitive workspace files",
    "summary": "## Summary `kernel/mcp/tools/file.go`'s `resolvePath()` includes an explicit comment stating its sensitive-path blocklist is meant to align with the HTTP file API's established blacklist (`refuseToAccess()` in `kernel/api/file.go`), following the remediation for GHSA-cvhv-7xhj-xjp8 (\"Unauthenticated Administrator takeover exfiltrated via the MCP\"), which specifically recommended restricting this tool's scope. In practice, the MCP tool implements only 1 of the 4 static blocklist entries the HTTP API enforces. ## Comparison `kernel/api/file.go` `refuseToAccess()` blocks: 1. `conf/conf.json` (API token, cookie signing key, accessAuthCode) 2. `data/snippets/conf.json` 3. the entire `data/templates` directory 4. `data/.siyuan/publishAccess.json` 5. (dynamic, per-request) any path the current publish-mode session isn't authorized for `kernel/mcp/tools/file.go` `resolvePath()` blocks only: ```go confPath := filepath.Join(util.ConfDir, \"conf.json\") if abs == confPath { return \"\", fmt.Errorf(\"access to conf.json is forbidden\") } ``` Items 2, 3, and 4 are absent. The tool's own `list`/`read`/`grep`/`find` actions remain fully functional against them. ## Impact An MCP client with access to the `file` tool (post-fix for GHSA-cvhv-7xhj-xjp8, i.e. a properly authenticated Administrator-level caller) can read `data/.siyuan/publishAccess.json` directly: ```go type PublishAccessItem struct { ID string `json:\"id\"` Visible bool `json:\"visible\"` Password string `json:\"password\"` // plaintext; em",
    "evidence": "osv:GHSA-c8r8-95hg-mp34",
    "products": [
      {
        "name": {
          "value": "github.com/siyuan-note/siyuan/kernel",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.0.0-20260808051406-3542530c505f",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-c8r8-95hg-mp34",
      "aliases": [
        "CVE-2026-60083",
        "GHSA-c8r8-95hg-mp34"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.0.0-20260808051406-3542530c505f"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/siyuan-note/siyuan/kernel",
            "purl": "pkg:golang/github.com/siyuan-note/siyuan/kernel",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-c8r8-95hg-mp34/GHSA-c8r8-95hg-mp34.json"
          }
        }
      ],
      "modified": "2026-10-27T15:00:04.502338776Z",
      "provider": "osv",
      "references": [
        "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c8r8-95hg-mp34",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-60083",
        "https://github.com/siyuan-note/siyuan/commit/3542530c505f13aa3fbd0343627409ca6c000dd2",
        "https://github.com/siyuan-note/siyuan",
        "https://github.com/siyuan-note/siyuan/releases/tag/v3.8.0",
        "https://www.vulncheck.com/advisories/siyuan-before-incomplete-path-blocklist-via-mcp-file-tool"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": null,
        "github_reviewed_at": "2026-10-27T14:43:57Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-60083",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 462800,
  "published_at": "2026-10-27T14:43:57+00:00"
}