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CVE-2026-30662

Estado: ModificadaMedia (6.5)—

ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager component. The 'download' method in 'concrete/controllers/backend/file.php' improperly manages memory when creating zip archives. It uses 'ZipArchive::addFromString' combined with 'file_get_contents', which loads the entire content of every selected file into PHP memory. An authenticated attacker can exploit this by requesting a bulk download of large files, triggering an Out-Of-Memory (OOM) condition that causes the PHP-FPM process to terminate (SIGSEGV) and the web server to return a 500 error.

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).

Tecnologías afectadas (1)

Concretecms — Concrete CMS

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-30662",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-30662",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-03-24T18:49:15.519526Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
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          "scope": "UNCHANGED",
          "version": "3.1",
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
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        "exploitabilityScore": 2.8
      },
      {
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
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          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
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  "affected": [
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          "product": "n/a",
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              "version": "n/a"
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  "published": "2026-03-24T15:16:34.457",
  "references": [
    {
      "url": "https://wang1rrr.github.io/2026/02/11/CVE-Report-ConcreteCMS-DoS/",
      "tags": [
        "Exploit",
        "Third Party Advisory"
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      "source": "cve@mitre.org"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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          "value": "CWE-400"
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      "type": "Secondary",
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      "description": [
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          "value": "CWE-400"
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager component. The 'download' method in 'concrete/controllers/backend/file.php' improperly manages memory when creating zip archives. It uses 'ZipArchive::addFromString' combined with 'file_get_contents', which loads the entire content of every selected file into PHP memory. An authenticated attacker can exploit this by requesting a bulk download of large files, triggering an Out-Of-Memory (OOM) condition that causes the PHP-FPM process to terminate (SIGSEGV) and the web server to return a 500 error."
    },
    {
      "lang": "es",
      "value": "ConcreteCMS v9.4.7 contiene una vulnerabilidad de denegación de servicio (DoS) en el componente del Administrador de Archivos. El método 'download' en 'concrete/controllers/backend/file.php' gestiona incorrectamente la memoria al crear archivos zip. Utiliza 'ZipArchive::addFromString' combinado con 'file_get_contents', lo que carga el contenido completo de cada archivo seleccionado en la memoria PHP. Un atacante autenticado puede explotar esto solicitando una descarga masiva de archivos grandes, lo que desencadena una condición de Out-Of-Memory (OOM) que provoca la terminación del proceso PHP-FPM (SIGSEGV) y que el servidor web devuelva un error 500."
    }
  ],
  "lastModified": "2026-06-17T10:32:52.257",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:concretecms:concrete_cms:9.4.7:*:*:*:*:*:*:*",
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  "sourceIdentifier": "cve@mitre.org"
}