CVE-2026-105205— SiYuan before 3.8.5 Information Disclosure via /api/block/getDocInfo and getDocsInfo
Quick assessment
Affected
siyuan-note siyuan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
思源笔记（SiYuan）在 3.8.5 版本之前存在一个信息泄露漏洞，该漏洞允许发布模式下的读者通过查询已发布的文档，从受密码保护且未启用发布功能的文档中获取反向链接块（backlink block）的 ID 和引用计数。攻击者可以向 或 接口发送 POST 请求，传入已发布文档的 ID，从而获取隐藏的引用块所对应的 refIDs 和 refCount，从而绕过发布机制所设定的保密边界。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud StorageAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| siyuan-note | siyuan | < 3.8.5 |
affected |
3.8.5 |
unaffected |
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I. Basic Information for CVE-2026-105205
Vulnerability Information
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Vulnerability Title
SiYuan before 3.8.5 Information Disclosure via /api/block/getDocInfo and getDocsInfo
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| siyuan-note | siyuan | 0 ~ 3.8.5 | - |
|
II. Public POCs for CVE-2026-105205
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-105205 (2)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-105205
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