CVE-2026-105205

SiYuan before 3.8.5 Information Disclosure via /api/block/getDocInfo and getDocsInfo

State: Published
Severity: 6.9 Medium
Published: Oct 4, 2026
Updated: Oct 5, 2026
Reserved: Oct 4, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	VulnCheck

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Affected Products

Product	Versions
siyuansiyuan-note	before 3.8.5Affected 3.8.5Not affected

References

GitHub Security Advisory (GHSA-v758-8w88-pfr2)vendor-advisory
VulnCheck Advisory: SiYuan before 3.8.5 Information Disclosure via /api/block/getDocInfo and getDocsInfothird-party-advisory

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