SiYuan Note up to 3.8.1 SQL Execution fullTextSearchBlock method privileges management

Summaryinfo

A vulnerability was found in SiYuan Note SiYuan up to 3.8.1 and classified as problematic. Affected is the function model.CheckReadonly/model.CheckReadonlyStatementInBox of the file /api/search/fullTextSearchBlock of the component SQL Execution. The manipulation of the argument method results in privileges management. This vulnerability is cataloged as CVE-2026-87808. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in SiYuan Note SiYuan up to 3.8.1. Affected is the function model.CheckReadonly/model.CheckReadonlyStatementInBox of the file /api/search/fullTextSearchBlock of the component SQL Execution. The manipulation of the argument method with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

SiYuan versions <= 3.8.1 contain an incomplete fix for CVE-2026-32767 (GHSA-j7wh-x834-p3r7). The prior fix (commit d5e2d0bc) added an administrator check for SQL mode (method=2) in POST /api/search/fullTextSearchBlock, but the endpoint still does not enforce the application's read-only boundary: for method=2 it forwards caller-supplied SQL to the blocks database query path without calling model.CheckReadonly or CheckReadonlyStatementInBox. As a result, when a workspace runs in read-only mode (--readonly=true), an authenticated administrator can submit arbitrary SQL through /api/search/fullTextSearchBlock and obtain raw read access to the blocks database, even though the dedicated /api/query/sql endpoint is blocked in that mode. Fixed in v3.8.2.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-87808 since 09/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are needed for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

Upgrading to version 3.8.2 eliminates this vulnerability.

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Productinfo

Vendor

• SiYuan Note

Name

• SiYuan

Version

• 3.8.0
• 3.8.1

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