Vulnerability in Siyuan-Note Siyuan
CVE-2026-82650
SiYuan 3.8.0 contains a path traversal / sensitive file exposure vulnerability in the RenderTemplate function (kernel/model/template.go), reachable via the POST /api/template/render endpoint (kernel/api/template.go). The endpoint restricts the supplied path only to the workspace directory (util.IsAbsPathInWorkspace) but, unlike the file API's refuseToAccess() blocklist, applies no sensitive-path exclusion. This allows an authenticated attacker to read sensitive workspace files, including conf/conf.json, which contains the API token and cookie signing key. The issue is fixed in v3.8.1.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-9jfx-rc58-h23j (vendor-advisory)
- www.vulncheck.com/advisories/siyuan-before-3.8.1-path-traversal-via-api-templat… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82650?
- CVE-2026-82650 is a medium-severity vulnerability in Siyuan-Note Siyuan, classified under Exposure of Resource to Wrong Sphere. CVSS score: 4.4/10. Published 2026-08-30.
- How severe is CVE-2026-82650?
- Medium severity. CVSS v3 base score is 4.4 out of 10.