---
id: CVE-2026-105205
title: >-
  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
  documen…
summary: >-
  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
  documen…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-200
vendor: siyuan-note
product: siyuan
affected:
  - siyuan < 3.8.5
published: '2026-10-04'
updated: '2026-10-04'
sourceUpdated: '2026-10-04T15:16:31.473'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-105205'
references:
  - url: >-
      https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v758-8w88-pfr2
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/siyuan-before-3.8.5-information-disclosure-via-api-block-getdocinfo-and-getdocsinfo
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-04T15:00:34.389Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.