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

Quick assessment

Affected
siyuan-note siyuan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan 在 v3.8.2 之前的版本中， 接口存在路径遍历漏洞，该接口未对 参数进行有效校验。经过认证的管理员可构造路径遍历序列，从而删除工作区目录之外的任意 和 文件。

CVSS 8.7 · High

Possible ATT&CK Techniques 2 AI

T1485.002 T1485 · Data Destruction
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I. Basic Information for CVE-2026-87815

Vulnerability Information
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Vulnerability Title
SiYuan before v3.8.2 Path Traversal via removeRiffDeck
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 0 ~ 3.8.2 -

II. Public POCs for CVE-2026-87815

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III. Intelligence Information for CVE-2026-87815

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Vendor Advisories for CVE-2026-87815 (2)

Same Patch Batch · siyuan-note · 2026-09-09 · 9 CVEs total

CVE-2026-87807 7.5 HIGH siyuan before v3.8.2 SQL Injection via fullTextSearchBlock
CVE-2026-87814 7.3 HIGH SiYuan before v3.8.2 Stored XSS via Asset Preview
CVE-2026-87811 7.3 HIGH SiYuan before v3.8.2 Stored XSS via notebook template paths
CVE-2026-87813 7.3 HIGH SiYuan before v3.8.2 Stored XSS via unescaped asset filenames
CVE-2026-87812 6.8 MEDIUM SiYuan before v3.8.2 Stored XSS via Bazaar iconURL
CVE-2026-87809 6.5 MEDIUM Siyuan before v3.8.2 Information Disclosure via Export Preview
CVE-2026-87810 5.3 MEDIUM Siyuan before v3.8.2 Information Disclosure via fullTextSearchBlock
CVE-2026-87808 4.9 MEDIUM SiYuan before v3.8.2 Read-Only Boundary Bypass via fullTextSearchBlock

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-73

V. Comments for CVE-2026-87815

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