siyuan-note SiYuan up to 3.7.3 Attribute-View Template Calculation Feature special elements in template engine

Summaryinfo

A vulnerability was found in siyuan-note SiYuan up to 3.7.3. It has been classified as problematic. The affected element is an unknown function of the component Attribute-View Template Calculation Feature. The manipulation leads to special elements in template engine. This vulnerability is uniquely identified as CVE-2026-73047. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability was found in siyuan-note SiYuan up to 3.7.3. It has been rated as problematic. This issue affects an unknown code block of the component Attribute-View Template Calculation Feature. The manipulation with an unknown input leads to a special elements in template engine vulnerability. Using CWE to declare the problem leads to CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. Impacted is confidentiality. The summary by CVE is:

siyuan versions <= 3.7.3 (fixed in v3.7.4) contain a server-side template injection vulnerability in the attribute-view Template calculation feature (introduced in v3.7.0-beta.1). The feature's template engine uses Sprig's unmodified function map, which still exposes the env, expandenv, and getHostByName functions that were removed elsewhere for CVE-2024-55660. A local, unauthenticated attacker (the kernel binds to 127.0.0.1 by default with no per-UID access control) can inject a malicious Template calculation formula to read environment variables belonging to the account running siyuan — including from a separate, unprivileged OS account — and to perform DNS lookups from the server's network position.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-73047 since 08/10/2026. The exploitation is known to be easy. Attacking locally is a requirement. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1221 according to MITRE ATT&CK.

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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