siyuan-note siyuan up to 3.7.2 API Endpoint getBackmentionDoc privileges management

Summaryinfo

A vulnerability classified as problematic has been found in siyuan-note siyuan up to 3.7.2. Affected by this issue is some unknown functionality of the file /api/ref/getBacklinkDoc,/api/ref/getBackmentionDoc of the component API Endpoint. This manipulation causes privileges management. This vulnerability appears as CVE-2026-68586. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in siyuan-note siyuan up to 3.7.2 and classified as problematic. Affected by this vulnerability is some unknown processing of the file /api/ref/getBacklinkDoc,/api/ref/getBackmentionDoc of the component API Endpoint. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality. The summary by CVE is:

SiYuan before v3.7.3 fails to apply publish-access filters to the getBacklinkDoc and getBackmentionDoc content endpoints (/api/ref/getBacklinkDoc and /api/ref/getBackmentionDoc). While the corresponding backlink list endpoints filter publish-forbidden documents, the content endpoints (gated only by CheckAuth) do not. A publish-mode reader — including an anonymous reader when publish Basic Auth is disabled — can call these endpoints directly with a publish-forbidden document's ID to retrieve its rendered DOM content and to determine whether the document references a given block (a reference-existence oracle).

The advisory is shared at github.com. This vulnerability is known as CVE-2026-68586 since 07/31/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 3.7.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-52274). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• siyuan-note

Name

• siyuan

Version

• 3.7.0
• 3.7.1
• 3.7.2

Website

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

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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