Information disclosure in Siyuan-Note Siyuan
CVE-2026-105205
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.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-v758-8w88-pfr2 (vendor-advisory)
- www.vulncheck.com/advisories/siyuan-before-3.8.5-information-disclosure-via-api… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-105205?
- CVE-2026-105205 is a medium-severity vulnerability in Siyuan-Note Siyuan, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-10-04.
- How severe is CVE-2026-105205?
- Medium severity. CVSS v3 base score is 5.3 out of 10.