CVE-2026-87815: Siyuan-Note Siyuan

High severity, CVSS 8.7. EPSS: 0.5% chance of exploitation in the next 30 days.

SiYuan versions before v3.8.2 contain a path traversal vulnerability in the /api/riff/removeRiffDeck endpoint that fails to validate the deckID parameter. An authenticated administrator can supply path traversal sequences to delete arbitrary .deck and .cards files outside the workspace directory.

Affected products

• Siyuan-Note Siyuan: before 3.8.2 (fixed in 3.8.2)

Published 2026-09-09. Last modified 2026-09-14.