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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 在 v3.8.2 之前版本中存在一个存储型跨站脚本（Stored XSS）漏洞，位于 Bazaar 包卡片中。该漏洞的原因是 元数据被直接插入到 HTML 的 标签的 属性中，且未进行转义处理。攻击者可通过在 Bazaar 列表中注入带有事件处理程序（如 ）的恶意 URL，当用户在已认证的 SiYuan 域下浏览 Bazaar 列表时，这些 JavaScript 将得以执行，从而允许发起 API 请求并操纵应用程序状态。

CVSS 6.8 · Medium
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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

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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