CVE-2026-85578: Siyuan-Note Siyuan

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

SiYuan through 3.8.1 contains an authorization bypass vulnerability in the /api/file/getFile endpoint that allows readers to retrieve files from notebooks explicitly configured as Visible:false. Attackers with reader role can access private workspace files including notebook metadata and internal configuration by knowing the hidden notebook identifier and file path.

Affected products

• Siyuan-Note Siyuan: up to and including 3.8.1

Published 2026-09-04. Last modified 2026-10-08.