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CVE-2021-47937

Estado: AplazadaAlta (8.7)—

e107 CMS 2.3.0 contains a remote code execution vulnerability that allows authenticated users with theme installation permissions to execute arbitrary commands by uploading malicious theme files. Attackers can upload a crafted theme package through the theme.php endpoint that deploys a web shell to the e107_themes directory, then execute system commands via the payload.php script.

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.

CVE-2021-47937 requiere autenticación (PR:L) y acceso de red (AV:N), lo que indica T1210. El atacante sube un tema malicioso que despliega una web shell (T1505.003) permitiendo ejecutar comandos arbitrarios (T1059).

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

Disable or Remove Feature or ProgramPrivileged Account ManagementVulnerability ScanningUser Account ManagementThreat Intelligence ProgramRestrict Web-Based Content

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

E107 — E107 CMSAI

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2021-47937",
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        "ssvcData": {
          "id": "CVE-2021-47937",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
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            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
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          "version": "2.0.3",
          "timestamp": "2026-05-12T02:38:47.959169Z"
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
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          "privilegesRequired": "LOW",
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    "cvssMetricV40": [
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        "cvssData": {
          "Safety": "NOT_DEFINED",
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          "Recovery": "NOT_DEFINED",
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          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
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          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
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          "modifiedUserInteraction": "NOT_DEFINED",
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          "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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      "affectedData": [
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          "product": "e107 CMS",
          "versions": [
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  "published": "2026-05-10T13:16:29.960",
  "references": [
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      "url": "https://e107.org/",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://e107.org/download",
      "source": "disclosure@vulncheck.com"
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    {
      "url": "https://www.exploit-db.com/exploits/50315",
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    {
      "url": "https://www.vulncheck.com/advisories/e107-cms-authenticated-remote-code-execution-via-theme-upload",
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  "vulnStatus": "Deferred",
  "weaknesses": [
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      "type": "Secondary",
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      "description": [
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          "value": "CWE-434"
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    {
      "lang": "en",
      "value": "e107 CMS 2.3.0 contains a remote code execution vulnerability that allows authenticated users with theme installation permissions to execute arbitrary commands by uploading malicious theme files. Attackers can upload a crafted theme package through the theme.php endpoint that deploys a web shell to the e107_themes directory, then execute system commands via the payload.php script."
    },
    {
      "lang": "es",
      "value": "e107 CMS 2.3.0 contiene una vulnerabilidad de ejecución remota de código que permite a usuarios autenticados con permisos de instalación de temas ejecutar comandos arbitrarios mediante la carga de archivos de temas maliciosos. Los atacantes pueden cargar un paquete de tema manipulado a través del endpoint theme.PHP que despliega una web shell en el directorio e107_themes, y luego ejecutar comandos del sistema a través del script payload.PHP."
    }
  ],
  "lastModified": "2026-07-25T10:10:00.167",
  "sourceIdentifier": "disclosure@vulncheck.com"
}