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CVE-2026-34585

Estado: AnalizadaAlta (8.2)—

SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -> SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs. This issue has been patched in version 3.6.2.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Stored XSS via crafted .sy.zip import (T1189). JavaScript inyectado ejecuta en Electron con APIs Node (T1059.007). En Electron escalado a RCE con acceso a APIs (T1068).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Restrict Web-Based ContentExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or ProgramApplication Isolation and SandboxingExploit Protection

Tecnologías afectadas (1)

B3log — Siyuan

CWE

Referencias

JSON original (NVD)

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      "value": "SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -> SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs. This issue has been patched in version 3.6.2."
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      "value": "SiYuan es un sistema de gestión de conocimiento personal. Antes de la versión 3.6.2, una vulnerabilidad permite que valores de atributos de bloque manipulados eludan el escape de atributos del lado del servidor cuando una entidad HTML se mezcla con caracteres especiales sin procesar. Un atacante puede incrustar un valor IAL malicioso dentro de un documento .sy, empaquetarlo como un .sy.zip, y hacer que la víctima lo importe a través del flujo de trabajo normal de Importar -&gt; SiYuan .sy.zip. Una vez que se abre la nota, el atributo malicioso sale de su contexto HTML original e inyecta un gestor de eventos, resultando en XSS almacenado. En el cliente de escritorio Electron, este XSS alcanza la ejecución remota de código porque el JavaScript inyectado se ejecuta con acceso a las API de Node/Electron. Este problema ha sido parcheado en la versión 3.6.2."
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  "lastModified": "2026-06-17T10:39:16.763",
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