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CVE-2026-23850

Estado: AnalizadaAlta (7.8)—

SiYuan is a personal knowledge management system. In versions prior to 3.5.4, the markdown feature allows unrestricted server side html-rendering which allows arbitrary file read (LFD). Version 3.5.4 fixes the issue.

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.

Aplicación web expuesta (AV:N, PR:N, UI:N) con LFD via markdown rendering permite lectura arbitraria de archivos (VC:H, CWE-22).

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

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Isolation and Sandboxing

Tecnologías afectadas (1)

B3log — Siyuan

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-23850",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2026-23850",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
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              "automatable": "yes"
            },
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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-01-20T20:04:00.809446Z"
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          "integrityImpact": "NONE",
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          "confidentialityImpact": "HIGH"
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    "cvssMetricV40": [
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          "version": "4.0",
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          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
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          "exploitMaturity": "PROOF_OF_CONCEPT",
          "providerUrgency": "NOT_DEFINED",
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          "vulnIntegrityImpact": "LOW",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
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          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
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          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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            }
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  ],
  "published": "2026-01-19T20:15:49.533",
  "references": [
    {
      "url": "https://github.com/siyuan-note/siyuan/blob/master/kernel/model/file.go#L1035",
      "tags": [
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      "url": "https://github.com/siyuan-note/siyuan/blob/v3.4.2/kernel/api/filetree.go#L799-L886",
      "tags": [
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    {
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    },
    {
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-cv54-7wv7-qxcw",
      "tags": [
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        "Patch",
        "Vendor Advisory"
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      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "security-advisories@github.com",
      "description": [
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          "value": "CWE-22"
        }
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "SiYuan is a personal knowledge management system. In versions prior to 3.5.4, the markdown feature allows unrestricted server side html-rendering which allows arbitrary file read (LFD). Version 3.5.4 fixes the issue."
    },
    {
      "lang": "es",
      "value": "SiYuan es un sistema de gestión de conocimiento personal. En versiones anteriores a la 3.5.4, la característica de markdown permite la renderización HTML sin restricciones del lado del servidor, lo que permite la lectura arbitraria de archivos (LFD). La versión 3.5.4 corrige el problema."
    }
  ],
  "lastModified": "2026-06-17T10:22:12.233",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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            }
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          "operator": "OR"
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      ]
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  "sourceIdentifier": "security-advisories@github.com"
}