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CVE-2026-34605— SiYuan: Reflected XSS via SVG namespace prefix bypass in SanitizeSVG ( getDynamicIcon, unauthenticated )

EPSS 0.14% · P34
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I. Basic Information for CVE-2026-34605

Vulnerability Information
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Vulnerability Title
SiYuan: Reflected XSS via SVG namespace prefix bypass in SanitizeSVG ( getDynamicIcon, unauthenticated )
Source: NVD (National Vulnerability Database)
Vulnerability Description
SiYuan is a personal knowledge management system. From version 3.6.0 to before version 3.6.2, the SanitizeSVG function introduced in version 3.6.0 to fix XSS in the unauthenticated /api/icon/getDynamicIcon endpoint can be bypassed by using namespace-prefixed element names such as <x:script xmlns:x="http://www.w3.org/2000/svg">. The Go HTML5 parser records the element's tag as "x:script" rather than "script", so the tag check passes it through. The SVG is served with Content-Type: image/svg+xml and no Content Security Policy; when a browser opens the response directly, its XML parser resolves the prefix to the SVG namespace and executes the embedded script. This issue has been patched in version 3.6.2.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
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 跨站脚本漏洞
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版本至3.6.2之前版本存在跨站脚本漏洞，该漏洞源于SanitizeSVG函数可能被绕过，导致跨站脚本攻击。
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)

Affected Products

VendorProductAffected VersionsCPESubscribe
siyuan-notesiyuan >= 3.6.0, < 3.6.2 -

II. Public POCs for CVE-2026-34605

#POC DescriptionSource LinkShenlong Link
1SiYuan Note through version 3.6.1 is vulnerable to unauthenticated reflected Cross-Site Scripting (XSS) in the `/api/icon/getDynamicIcon` endpoint due to improper filtering of SVG elements with a namespace prefix (such as `<x:script>`). By using a namespaced script element, attackers can bypass the `SanitizeSVG` function and execute arbitrary JavaScript in the victim’s browser upon visiting a crafted link. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-34605.yamlPOC Details
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III. Intelligence Information for CVE-2026-34605

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Same Patch Batch · siyuan-note · 2026-03-31 · 5 CVEs total

CVE-2026-344499.7 CRITICALSiYuan: Cross-Origin RCE via Permissive CORS Policy and JavaScript Snippet Injection
CVE-2026-344489.1 CRITICALSiYuan: Stored XSS in Attribute View gallery/kanban cover rendering allows arbitrary comma
CVE-2026-345858.6 HIGHSiYuan: Stored XSS in imported .sy.zip content leads to arbitrary command execution
CVE-2026-344537.5 HIGHSiYuan: Broken access control in /api/bookmark/getBookmark allows unauthenticated publish

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-34605

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