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CVE-2026-87812— SiYuan before v3.8.2 Stored XSS via Bazaar iconURL

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Bazaar包卡片中iconURL元数据未经转义直接插入HTML img src属性，容易受到存储型跨站脚本攻击，可能导致攻击者注入带事件处理器的恶意URL，在用户查看Bazaar列表时执行JavaScript并发起API请求、操纵应用状态。

CVSS 6.8 · Medium EPSS 0.36% · P28

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-2026-87812

Vulnerability Information
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Vulnerability Title
SiYuan before v3.8.2 Stored XSS via Bazaar iconURL
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in Bazaar package cards where the iconURL metadata is inserted directly into HTML img src attributes without escaping. Attackers can inject malicious URLs with event handlers that execute JavaScript in the authenticated SiYuan origin when users view Bazaar listings, enabling API requests and application state manipulation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/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Bazaar包卡片中iconURL元数据未经转义直接插入HTML img src属性，容易受到存储型跨站脚本攻击，可能导致攻击者注入带事件处理器的恶意URL，在用户查看Bazaar列表时执行JavaScript并发起API请求、操纵应用状态。
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-2026-87812

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III. Intelligence Information for CVE-2026-87812

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Vendor Advisories for CVE-2026-87812 (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-2026-87814 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-2026-87809 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

V. Comments for CVE-2026-87812

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