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CVE-2026-39846

Estado: AnalizadaCrítica (9)—

SiYuan is a personal knowledge management system. Prior to 3.6.4, a malicious note synced to another user can trigger remote code execution in the SiYuan Electron desktop client. The root cause is that table caption content is stored without safe escaping and later unescaped into rendered HTML, creating a stored XSS sink. Because the desktop renderer runs with nodeIntegration enabled and contextIsolation disabled, attacker-controlled JavaScript executes with access to Node.js APIs. In practice, an attacker can import a crafted note into a synced workspace, wait for the victim to sync, and achieve code execution when the victim opens the note. This vulnerability is fixed in 3.6.4.

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 contenido de tabla (CWE-79) que ejecuta JavaScript en cliente Electron con nodeIntegration habilitado, permitiendo ejecución de código arbitrario tras sincronización de nota maliciosa.

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 ContentUser TrainingPrivileged Account ManagementNetwork Intrusion PreventionLimit Software InstallationExecution Prevention

Tecnologías afectadas (1)

B3log — Siyuan

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-39846",
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          "options": [
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              "automatable": "no"
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          "version": "2.0.3",
          "timestamp": "2026-04-08T15:23:34.478628Z"
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          "attackVector": "NETWORK",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
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          "value": "CWE-79"
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          "value": "CWE-94"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "SiYuan is a personal knowledge management system. Prior to 3.6.4, a malicious note synced to another user can trigger remote code execution in the SiYuan Electron desktop client. The root cause is that table caption content is stored without safe escaping and later unescaped into rendered HTML, creating a stored XSS sink. Because the desktop renderer runs with nodeIntegration enabled and contextIsolation disabled, attacker-controlled JavaScript executes with access to Node.js APIs. In practice, an attacker can import a crafted note into a synced workspace, wait for the victim to sync, and achieve code execution when the victim opens the note. This vulnerability is fixed in 3.6.4."
    },
    {
      "lang": "es",
      "value": "SiYuan es un sistema de gestión de conocimiento personal. Antes de la versión 3.6.4, una nota maliciosa sincronizada con otro usuario puede desencadenar la ejecución remota de código en el cliente de escritorio SiYuan Electron. La causa raíz es que el contenido de la leyenda de la tabla se almacena sin un escape seguro y luego se desescapa en HTML renderizado, creando un sumidero XSS almacenado. Debido a que el renderizador de escritorio se ejecuta con nodeIntegration habilitado y contextIsolation deshabilitado, el JavaScript controlado por el atacante se ejecuta con acceso a las API de Node.js. En la práctica, un atacante puede importar una nota manipulada en un espacio de trabajo sincronizado, esperar a que la víctima sincronice y lograr la ejecución de código cuando la víctima abre la nota. Esta vulnerabilidad está corregida en la versión 3.6.4."
    }
  ],
  "lastModified": "2026-07-20T20:10:00.110",
  "configurations": [
    {
      "nodes": [
        {
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          "cpeMatch": [
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}