# CVE-2026-118680: SiYuan 3.8.7 through 3.8.8 Path Traversal via GLOBALROOT Alias

Status: published. Published: 2026-10-28. Updated: 2026-11-02.

SiYuan 3.8.7 through 3.8.8 fails to normalize Windows GLOBALROOT device-namespace aliases, bypassing the IsSensitivePath denylist. Attackers can invoke importStdMd with a GLOBALROOT-prefixed path to copy the API token and TLS private key into the publicly served assets directory.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- siyuan-note / siyuan (github.com/siyuan-note/siyuan/kernel): ≥ 3.8.7; ≤ 3.8.8 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 5.9 (medium); CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 4.4 (medium); CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.46% as of 2026-11-02; percentile 39.77%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-22

## Exploit evidence

- exploit: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-gg3p-r4g8-vxg2 (ADP: CISA-ADP)

## References

- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-gg3p-r4g8-vxg2 (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/siyuan-3.8.7-through-3.8.8-path-traversal-via-globalroot-alias (CNA: VulnCheck; third-party-advisory)

- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-gg3p-r4g8-vxg2 (ADP: CISA-ADP; exploit)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-118680; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-118680; retrieved 2026-11-02; source updated Not reported

Revision: 4a78cf44e37ffcdf7fdd766c0fb9748e6ad7c9bd56e97690f197f83a125b3645

Canonical: https://y2.dev/cve/CVE-2026-118680

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.