SiYuan MCP asset.upload Reads Arbitrary Absolute File Paths (Workspace Boundary Bypass)

{
  "id": "9675c39f31e9a06fd8a3ab97ec42005714b137c8827e802a95644341c9351b25",
  "url": "https://osv.dev/vulnerability/GHSA-p23f-cm6q-2qp8",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "SiYuan MCP asset.upload Reads Arbitrary Absolute File Paths (Workspace Boundary Bypass)",
    "summary": "# Security Advisory — SiYuan MCP `asset.upload` Reads Arbitrary Absolute File Paths (Workspace Boundary Bypass) | Field | Value | |---|---| | **Disclosed by** | joysinleung (`joysinleung@gmail.com`) | | **Report date** | 2026-08-13 | | **Product** | SiYuan (思源笔记) — `siyuan-note/siyuan` | | **Go module** | `github.com/siyuan-note/siyuan/kernel` | | **Affected versions** | `<= 3.8.0` (latest release at report time; statically confirmed on v3.8.0) | | **Patched versions** | 3.8.1 | | **Component** | `kernel/mcp/tools/asset.go` (`assetUpload`), `kernel/model/upload.go` (`InsertLocalAssets`) | | **Relationship to prior advisory** | **Residual of CVE-2026-66012** (GHSA-cvhv-7xhj-xjp8) MCP remediation. See §Relationship. | | **EPSS (exploitation probability)** | Low. Requires the AI Agent to invoke `asset.upload` and the user to approve the (category-level) confirmation; reachable via prompt-injection of the agent. | | **KEV (CISA Known Exploited)** | No (not listed in CISA KEV at report time). | | **Default-config reachable** | **Partial** — requires the Agent/MCP surface to be configured (admin) and a user approval click; the boundary check itself is entirely absent, so any approved upload reads outside the workspace. | --- ## Summary SiYuan exposes a native MCP tool `asset` → `asset.upload`. Its `files` argument is documented as a **comma-separated list of absolute file paths**. The handler (`kernel/mcp/tools/asset.go:195`) only normalizes each entry with `filepath.Abs(...)` — it",
    "evidence": "osv:GHSA-p23f-cm6q-2qp8",
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        "GO-2026-6655"
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          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N"
        }
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          "package": {
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            "ecosystem": "Go"
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          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-p23f-cm6q-2qp8/GHSA-p23f-cm6q-2qp8.json"
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      "modified": "2026-10-07T17:56:03.822617661Z",
      "provider": "osv",
      "references": [
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        "https://github.com/siyuan-note/siyuan/commit/b26a4a307b8ae5067387ea76ce1fad6b7f4bf9e7",
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        "nvd_published_at": null,
        "github_reviewed_at": "2026-10-02T23:16:56Z"
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        "value": "CVE-2026-82233",
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  "source_id": "core-osv",
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  "published_at": "2026-10-02T23:16:56+00:00"
}

{
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  "url": "https://osv.dev/vulnerability/GO-2026-6655",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "SiYuan MCP asset.upload Reads Arbitrary Absolute File Paths (Workspace Boundary Bypass) in github.com/siyuan-note/siyuan/kernel",
    "summary": "SiYuan MCP asset.upload Reads Arbitrary Absolute File Paths (Workspace Boundary Bypass) in github.com/siyuan-note/siyuan/kernel",
    "evidence": "osv:GO-2026-6655",
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  "source_id": "core-osv",
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  "published_at": "2026-10-07T14:10:14+00:00"
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