CVE-2026-34605

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.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/siyuan-note/siyuan/issues/17246	Issue Tracking
https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2	Release Notes
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-73g7-86qr-jrg3	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-31 22:16

Updated : 2026-06-17 10:39

NVD link : CVE-2026-34605

Mitre link : CVE-2026-34605

CVE.ORG link : CVE-2026-34605

JSON object : View

Products Affected

b3log

siyuan

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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."}, {"lang": "es", "value": "SiYuan es un sistema de gesti\u00f3n de conocimiento personal. Desde la versi\u00f3n 3.6.0 hasta antes de la versi\u00f3n 3.6.2, la funci\u00f3n SanitizeSVG introducida en la versi\u00f3n 3.6.0 para corregir XSS en el endpoint no autenticado /API/icon/getDynamicIcon puede ser eludida mediante el uso de nombres de elementos con prefijo de espacio de nombres como . El analizador HTML5 de Go registra la etiqueta del elemento como 'x:script' en lugar de 'script', por lo que la verificaci\u00f3n de la etiqueta lo permite pasar. El SVG se sirve con Content-Type: image/svg+xml y sin Pol\u00edtica de Seguridad de Contenido; cuando un navegador abre la respuesta directamente, su analizador XML resuelve el prefijo al espacio de nombres SVG y ejecuta el script incrustado. Este problema ha sido parcheado en la versi\u00f3n 3.6.2."}], "lastModified": "2026-06-17T10:39:18.647", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "74DCC4D9-9D0B-4E47-8DB2-2CEF6E189B47", "versionEndExcluding": "3.6.2", "versionStartIncluding": "3.6.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}