CVE-2026-33066

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-33066
SiYuan is a personal knowledge management system. In versions 3.6.0 and below, the backend renderREADME function uses lute.New() without calling SetSanitize(true), allowing raw HTML embedded in Markdown to pass through unmodified. The frontend then assigns the rendered HTML to innerHTML without any additional sanitization. A malicious package author can embed arbitrary JavaScript in their README that executes when a user clicks to view the package details. Because SiYuan's Electron configuration enables nodeIntegration: true with contextIsolation: false, this XSS escalates directly to full Remote Code Execution. The issue was patched in version 3.6.1.

9.0 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 2.3 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References
Link Resource
https://github.com/siyuan-note/siyuan/commit/b382f50e1880ed996364509de5a10a72d7409428 Patch
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4663-4mpg-879v Exploit Mitigation Vendor Advisory
Configurations

Configuration 1 (hide)

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

23 Mar 2026, 15:31

Type Values Removed Values Added
Summary
  • (es) SiYuan es un sistema de gestión de conocimiento personal. En las versiones 3.6.0 e inferiores, la función renderREADME del backend utiliza lute.New() sin llamar a SetSanitize(true), lo que permite que el HTML sin procesar incrustado en Markdown pase sin modificar. El frontend luego asigna el HTML renderizado a innerHTML sin ninguna sanitización adicional. Un autor de paquete malicioso puede incrustar JavaScript arbitrario en su README que se ejecuta cuando un usuario hace clic para ver los detalles del paquete. Debido a que la configuración de Electron de SiYuan habilita nodeIntegration: true con contextIsolation: false, este XSS escala directamente a la ejecución remota de código completa. El problema fue parcheado en la versión 3.6.1.
CPE cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*
First Time B3log
B3log siyuan
References () https://github.com/siyuan-note/siyuan/commit/b382f50e1880ed996364509de5a10a72d7409428 - () https://github.com/siyuan-note/siyuan/commit/b382f50e1880ed996364509de5a10a72d7409428 - Patch
References () https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4663-4mpg-879v - () https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4663-4mpg-879v - Exploit, Mitigation, Vendor Advisory
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 9.0

20 Mar 2026, 09:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-20 09:16

Updated : 2026-03-23 15:31

NVD link : CVE-2026-33066

Mitre link : CVE-2026-33066

CVE.ORG link : CVE-2026-33066

JSON object : View

Products Affected

b3log

  • siyuan
CWE
CWE-79

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