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CVE-2026-34448

Estado: AnalizadaCrítica (9)—

SiYuan is a personal knowledge management system. Prior to version 3.6.2, an attacker who can place a malicious URL in an Attribute View mAsse field can trigger stored XSS when a victim opens the Gallery or Kanban view with “Cover From -> Asset Field” enabled. The vulnerable code accepts arbitrary http(s) URLs without extensions as images, stores the attacker-controlled string in coverURL, and injects it directly into an <img src="..."> attribute without escaping. In the Electron desktop client, the injected JavaScript executes with nodeIntegration enabled and contextIsolation disabled, so the XSS reaches arbitrary OS command execution under the victim’s account. 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.

XSS almacenado en campo de atributo que ejecuta JavaScript en cliente Electron con nodeIntegration habilitado, alcanzando ejecución de comandos OS. Requiere interacción del usuario (abrir Gallery/Kanban) y URL maliciosa plantada por atacante.

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 PreventionApplication Isolation and SandboxingExploit ProtectionUpdate SoftwareUser Training

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, an attacker who can place a malicious URL in an Attribute View mAsse field can trigger stored XSS when a victim opens the Gallery or Kanban view with “Cover From -> Asset Field” enabled. The vulnerable code accepts arbitrary http(s) URLs without extensions as images, stores the attacker-controlled string in coverURL, and injects it directly into an <img src=\"...\"> attribute without escaping. In the Electron desktop client, the injected JavaScript executes with nodeIntegration enabled and contextIsolation disabled, so the XSS reaches arbitrary OS command execution under the victim’s account. 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, un atacante que puede colocar una URL maliciosa en un campo 'mAsse' de la vista de atributos puede desencadenar XSS almacenado cuando una víctima abre la vista de Galería o Kanban con 'Cubrir desde  ->  Campo de activo' habilitado. El código vulnerable acepta URLs HTTP(s) arbitrarias sin extensiones como imágenes, almacena la cadena controlada por el atacante en 'coverURL' y la inyecta directamente en un atributo '<img src=\"...\"> sin escapar. En el cliente de escritorio Electron, el JavaScript inyectado se ejecuta con 'nodeIntegration' habilitado y 'contextIsolation' deshabilitado, por lo que el XSS alcanza la ejecución arbitraria de comandos del sistema operativo bajo la cuenta de la víctima. Este problema ha sido parcheado en la versión 3.6.2."
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  "lastModified": "2026-07-24T21:10:00.143",
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