What is CVE-2026-103763?

CVE-2026-103763 is a medium-severity vulnerability in Siyuan-Note Siyuan, classified under Information Disclosure. CVSS score: 5.8/10. Published 2026-10-02.

How severe is CVE-2026-103763?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Information disclosure in Siyuan-Note Siyuan

CVE-2026-103763

SiYuan before v3.8.5 contains an information disclosure vulnerability that allows read-only publish readers to learn metadata of publish-excluded documents through the getNotebookInfo endpoint. Attackers, including anonymous visitors when no reader password is set, can query publish-visible notebooks to obtain document count, size and modification timestamps of hidden documents.

Vulnerability class: Information Disclosure

Published 2026-10-02 · last modified 2026-10-02.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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

Siyuan-Note Siyuan

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

github.com/siyuan-note/siyuan/security/advisories/GHSA-ccxp-q3vg-jvgj (vendor-advisory)
www.vulncheck.com/advisories/siyuan-before-3.8.5-information-disclosure-via-api… (third-party-advisory)

Frequently asked questions

What is CVE-2026-103763?: CVE-2026-103763 is a medium-severity vulnerability in Siyuan-Note Siyuan, classified under Information Disclosure. CVSS score: 5.8/10. Published 2026-10-02.
How severe is CVE-2026-103763?: Medium severity. CVSS v3 base score is 5.8 out of 10.