CVE-2026-82654: Siyuan-Note Siyuan

High severity, CVSS 8.9. EPSS: 0.4% chance of exploitation in the next 30 days.

SiYuan before v3.8.1 fails to properly escape block name, alias, and memo fields in hint, backlink, and breadcrumb rendering functions. Attackers can set a block's name to contain HTML/script tags that execute when another user views documents referencing or displaying that block.

Affected products

• Siyuan-Note Siyuan: before 3.8.1 (fixed in 3.8.1)

Published 2026-08-30. Last modified 2026-09-01.