Information Disclosure in SiYuan Prior to 3.6.2 via API Endpoints

Publication date: 2026-03-26

Last updated on: 2026-03-30

Assigner: GitHub, Inc.

Description

SiYuan is a personal knowledge management system. Prior to version 3.6.2, document IDs were retrieved via the /api/file/readDir interface, and then the /api/block/getChildBlocks interface was used to view the content of all documents. Version 3.6.2 patches the issue.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-03-26

Last Modified

2026-03-30

Generated

2026-07-06

AI Q&A

2026-03-27

EPSS Evaluated

2026-07-05

NVD

CVE-2026-33669

Affected Vendors & Products

Vendor	Product	Version / Range
b3log	siyuan	to 3.6.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

The vulnerability in SiYuan, a personal knowledge management system, exists in versions prior to 3.6.2. It involves the way document IDs were accessed through the /api/file/readDir interface, which then allowed the /api/block/getChildBlocks interface to view the content of all documents. This means an attacker could potentially retrieve and view all document contents by exploiting these interfaces.

Impact Analysis

This vulnerability can have a severe impact as it allows unauthorized access to all document contents within the SiYuan system. Given the CVSS score of 9.8, it indicates a critical risk with high confidentiality, integrity, and availability impacts, meaning sensitive information could be exposed, altered, or deleted without permission.

Mitigation Strategies

The immediate step to mitigate this vulnerability is to upgrade SiYuan to version 3.6.2 or later, as this version patches the issue.

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