CVE-2026-105205

Medium

Description

SiYuan before 3.8.5 contains an information disclosure vulnerability that allows publish-mode readers to learn backlink block IDs and reference counts from password-protected and publish-disabled documents by querying a published document. Attackers can send POST requests to /api/block/getDocInfo or getDocsInfo for a published document ID to obtain refIDs and refCount of hidden referencing blocks, bypassing the publish confidentiality boundary.

SeverityMedium

CVSS5.3

Exploit probability—

ProductSiyuan

PublishedOct 4, 2026

First seenOct 4, 2026

Weakness typeCWE-200Sensitive information exposure

How to fix

Update

siyuan-note siyuan3.8.5 or later

Vendor advisories

github.com/siyuan-note/siyuan/security/advisories/GHSA-v758-8w88-pfr2

Affected products

Product	Affected versions	Fixed in
siyuan-note siyuan	v < 3.8.5	3.8.5

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