CVE-2026-23850: b3log Siyuan

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

SiYuan is a personal knowledge management system. In versions prior to 3.5.4, the markdown feature allows unrestricted server side html-rendering which allows arbitrary file read (LFD). Version 3.5.4 fixes the issue.

Affected products

• b3log Siyuan: before 3.5.4 (fixed in 3.5.4)

Published 2026-01-19. Last modified 2026-06-17.