siyuan-note SiYuan up to 3.7.3 database_clean MCP tool attribute_view.go RemoveUnusedAttributeView ID path traversal

Summaryinfo

A vulnerability was found in siyuan-note SiYuan up to 3.7.3. It has been declared as critical. Affected is the function RemoveUnusedAttributeView of the file kernel/model/attribute_view.go of the component database_clean MCP tool. The manipulation of the argument ID results in path traversal. This vulnerability is identified as CVE-2026-74798. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in siyuan-note SiYuan up to 3.7.3. It has been classified as critical. Affected is the function RemoveUnusedAttributeView of the file kernel/model/attribute_view.go of the component database_clean MCP tool. The manipulation of the argument id 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, integrity, and availability. CVE summarizes:

SiYuan kernel before v3.7.4 contains a path traversal vulnerability in the database_clean MCP tool. The tool performs only an empty-string check on the id parameter before passing it to RemoveUnusedAttributeView (kernel/model/attribute_view.go), which builds a filesystem path via filepath.Join without validating that id matches SiYuan's node-ID format. An authenticated MCP client can supply path traversal sequences in id to cause the kernel to copy an arbitrary file readable by the process into SiYuan's history directory (arbitrary file read) and then delete the original file (arbitrary file deletion). The corresponding HTTP API handler was hardened in GHSA-7hm9-v7vf-7g4w, but this MCP caller was not.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-74798 since 08/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 3.7.4 eliminates this vulnerability.

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Productinfo

Vendor

• siyuan-note

Name

• SiYuan

Version

• 3.7.0
• 3.7.1
• 3.7.2
• 3.7.3

Website

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

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