Medium severity · published Aug 30, 2026
CVE-2026-82650
SiYuan before v3.8.1 Path Traversal via /api/template/render
4.4
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
before 3.8.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-82650
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-82650
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9jfx-rc58-h23j
www.vulncheck.com
https://www.vulncheck.com/advisories/siyuan-before-3.8.1-path-traversal-via-api-template-render
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