CVE-2026-103762: Siyuan-Note Siyuan

Medium severity, CVSS 5.3. EPSS: 0.2% chance of exploitation in the next 30 days.

SiYuan before v3.8.5 contains a missing authorization vulnerability in the getRefCreateSavePath, getShorthandSavePath, and getDocCreateSavePath endpoints that allows read-only publish visitors to learn unpublished notebook box IDs. Attackers with read-only or anonymous publish access can POST any open notebook ID to receive the global save-box ID and save-path template, revealing a hidden notebook's existence and creation time.

Affected products

• Siyuan-Note Siyuan: before 3.8.5 (fixed in 3.8.5)

Published 2026-10-02. Last modified 2026-10-06.