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CVE-2026-32940— SiYuan has a SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CVE-2026-29183)

CVSS 9.3 · Critical EPSS 0.09% · P25
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I. Basic Information for CVE-2026-32940

Vulnerability Information
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Vulnerability Title
SiYuan has a SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CVE-2026-29183)
Source: NVD (National Vulnerability Database)
Vulnerability Description
SiYuan is a personal knowledge management system. In versions 3.6.0 and below, SanitizeSVG has an incomplete blocklist — it blocks data:text/html and data:image/svg+xml in href attributes but misses data:text/xml and data:application/xml, both of which can render SVG with JavaScript execution. The unauthenticated /api/icon/getDynamicIcon endpoint serves user-controlled input (via the content parameter) directly into SVG markup using fmt.Sprintf with no escaping, served as Content-Type: image/svg+xml. This creates a click-through XSS: a victim navigates to a crafted URL, sees an SVG with an injected link, and clicking it triggers JavaScript via the bypassed MIME types. The attack requires direct navigation to the endpoint or <object>/<embed> embedding, since <img> tag rendering in the frontend doesn't allow interactive links. This issue has been fixed in version 3.6.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
Vulnerability Title
SiYuan 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan开源的一个隐私至上的个人知识管理系统。 SiYuan 3.6.0及之前版本存在安全漏洞，该漏洞源于SanitizeSVG存在不完整的阻止列表且未对用户输入进行转义，可能导致点击型跨站脚本攻击。
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)

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Affected Products

VendorProductAffected VersionsCPESubscribe
siyuan-notesiyuan < 3.6.1 -

II. Public POCs for CVE-2026-32940

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III. Intelligence Information for CVE-2026-32940

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Same Patch Batch · siyuan-note · 2026-03-20 · 8 CVEs total

CVE-2026-329389.9 CRITICALSiYuan has an Arbitrary File Read in its Desktop Publish Service
CVE-2026-327679.8 CRITICALSiYuan: Authorization Bypass Allows Arbitrary SQL Execution via Search API
CVE-2026-332037.5 HIGHSiYuan has an Unauthenticated WebSocket DoS via Auth Keepalive Bypass
CVE-2026-334767.5 HIGHSiYuan has an Unauthenticated Arbitrary File Read via Path Traversal
CVE-2026-331946.8 MEDIUMSiYuan has an Incomplete Fix for IsSensitivePath Denylist Allows File Read from /opt, /usr
CVE-2026-33067SiYuan has Stored XSS to RCE via Unsanitized Bazaar Package Metadata
CVE-2026-33066SiYuan has Stored XSS to RCE via Unsanitized Bazaar README Rendering

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-79

V. Comments for CVE-2026-32940

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