---
title: "CVE-2026-87815: SiYuan - Path Traversal"
description: "SiYuan < v3.8.2 contains a path traversal caused by improper validation of the deckID parameter in /api/riff/removeRiffDeck, letting authenticated administrators delete arbitrary .deck and .cards files outside the workspace directory."
url: https://panop.io/threat-heartbeat/CVE-2026-87815/
---

# CVE-2026-87815 SiYuan - Path Traversal

SiYuan < v3.8.2 contains a path traversal caused by improper validation of the deckID parameter in /api/riff/removeRiffDeck, letting authenticated administrators delete arbitrary .deck and .cards files outside the workspace directory.

CVSS base score 8.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.48% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-87815)

## Details

Type

Path Traversal

Impact

Data Tampering

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H

Published

9 September 2026

Updated

15 October 2026

Weakness

[CWE-73](https://cwe.mitre.org/data/definitions/73.html)

## Vendor fix

Update to version v3.8.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-87815](https://nvd.nist.gov/vuln/detail/CVE-2026-87815)
- [https://github.com/siyuan-note/siyuan/security/advisories/GHSA-94vh-rpgr-rpwc](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://www.vulncheck.com/advisories/siyuan-before-3.8.2-path-traversal-via-removeriffdeck)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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