CVE-2026-87815: SiYuan before v3.8.2 Path Traversal via removeRiffDeck

Severity: high (CVSS 8.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-09 · updated 2026-09-14
Weakness: CWE-73

Description

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

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.8.2. Check the vendor advisory for mitigations.

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-94vh-rpgr-rpwc
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-path-traversal-via-removeriffdeck
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-94vh-rpgr-rpwc

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