siyuan-note SiYuan up to 3.8.0 Template Rendering kernel/model/template.go RenderTemplate path traversal

Summaryinfo

A vulnerability has been found in siyuan-note SiYuan up to 3.8.0 and classified as problematic. Affected by this vulnerability is the function RenderTemplate of the file kernel/model/template.go of the component Template Rendering. Performing a manipulation results in path traversal. This vulnerability is known as CVE-2026-82650. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in siyuan-note SiYuan up to 3.8.0. This affects the function RenderTemplate of the file kernel/model/template.go of the component Template Rendering. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-82650 since 08/30/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 3.8.1 eliminates this vulnerability.

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Productinfo

Vendor

• siyuan-note

Name

• SiYuan

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8.0

Website

• Product: https://github.com/siyuan-note/siyuan/

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