SiYuan-Note SiYuan up to 3.8.5 Kernel Plugin HTTP Server File Path path traversal

Summaryinfo

A vulnerability labeled as problematic has been found in SiYuan-Note SiYuan up to 3.8.5. This vulnerability affects the function File of the component Kernel Plugin HTTP Server. Executing a manipulation of the argument Path can lead to path traversal. This vulnerability is tracked as CVE-2026-109309. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in SiYuan-Note SiYuan up to 3.8.5. It has been declared as problematic. This vulnerability affects the function File of the component Kernel Plugin HTTP Server. The manipulation of the argument Path with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality. CVE summarizes:

SiYuan v3.7.0 before v3.8.6 contains an absolute path traversal vulnerability in the kernel's private plugin HTTP server, which passes a kernel plugin handler's ResponseFile.Path to gin's Context.File without validation. Attackers supplying a malicious kernel plugin can return an absolute path to read any file readable by the SiYuan process, including the API token and conf.json.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-109309 since 10/12/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 3.8.6 eliminates this vulnerability.

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Productinfo

Vendor

• SiYuan-Note

Name

• SiYuan

Version

• 3.8.0
• 3.8.1
• 3.8.2
• 3.8.3
• 3.8.4
• 3.8.5

Website

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

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