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CVE-2026-87814— SiYuan before v3.8.2 Stored XSS via Asset Preview

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是SiYuan团队开源的一个以隐私为先的个人知识管理系统。 SiYuan 3.8.2之前版本存在跨站脚本漏洞，该漏洞源于搜索资源预览功能未对索引资源内容进行转义便通过innerHTML插入DOM，可能导致存储型跨站脚本攻击，攻击者在工作区放置特制文本资源后，受害者预览资源时可在SiYuan源中执行JavaScript，从而进行已认证API请求和工作区操纵。

CVSS 7.3 · High EPSS 0.37% · P29

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.8.2 affected
3.8.2 unaffected
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I. Basic Information for CVE-2026-87814

Vulnerability Information
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Vulnerability Title
SiYuan before v3.8.2 Stored XSS via Asset Preview
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in the search asset preview feature that fails to escape indexed asset content before inserting it into the DOM using innerHTML. Attackers who can place crafted text assets in a workspace can execute JavaScript in the SiYuan origin when victims preview the assets, enabling authenticated API requests and workspace manipulation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一个以隐私为先的个人知识管理系统。 SiYuan 3.8.2之前版本存在跨站脚本漏洞，该漏洞源于搜索资源预览功能未对索引资源内容进行转义便通过innerHTML插入DOM，可能导致存储型跨站脚本攻击，攻击者在工作区放置特制文本资源后，受害者预览资源时可在SiYuan源中执行JavaScript，从而进行已认证API请求和工作区操纵。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

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

II. Public POCs for CVE-2026-87814

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III. Intelligence Information for CVE-2026-87814

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Vendor Advisories for CVE-2026-87814 (2)

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

CVE-2026-87815 8.7 HIGH SiYuan before v3.8.2 Path Traversal via removeRiffDeck
CVE-2026-87807 7.5 HIGH siyuan before v3.8.2 SQL Injection via fullTextSearchBlock
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-79