CVE-2026-72803: Siyuan-Note Siyuan

Medium severity, CVSS 5.8. EPSS: 0.3% chance of exploitation in the next 30 days.

SiYuan versions before v3.7.4 fail to enforce publish-access checks in the getBlockAttrs and batchGetBlockAttrs endpoints. Attackers can retrieve block attributes including names, aliases, memos, and custom fields from protected documents by sending POST requests with block IDs.

Affected products

• Siyuan-Note Siyuan: before 3.7.4 (fixed in 3.7.4)

Published 2026-08-12. Last modified 2026-08-26.