What’s Vulnerable › Vulnerabilities

CVE-2026-105205: SiYuan before 3.8.5 Information Disclosure via /api/block/getDocInfo and getDocsInfo

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-04 · updated 2026-10-05
• Weakness: CWE-200

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.

Affected products

• siyuan-note siyuan: before 3.8.5 — fixed in 3.8.5

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.8.5. Check the vendor advisory for mitigations.

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v758-8w88-pfr2
• https://www.vulncheck.com/advisories/siyuan-before-3.8.5-information-disclosure-via-api-block-getdocinfo-and-getdocsinfo
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v758-8w88-pfr2

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