CVE-2026-82654
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.
- Published Aug 30, 2026
- CVSS 9.3 critical
- 0.4% chance of exploitation in the next 30 days (EPSS)
- A fix is available