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CVE-2026-27636

Estado: AnalizadaAlta (8.8)—

FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.206, FreeScout's file upload restriction list in `app/Misc/Helper.php` does not include `.htaccess` or `.user.ini` files. On Apache servers with `AllowOverride All` (a common configuration), an authenticated user can upload a `.htaccess` file to redefine how files are processed, enabling Remote Code Execution. This vulnerability can be exploited on its own or in combination with CVE-2026-27637. Version 1.8.206 fixes both vulnerabilities.

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.

Acceso remoto autenticado (PR:L) a servicio remoto (AV:N) sin interacción. Upload de .htaccess en Apache permite ejecución de código arbitrario, web shell y comandos en el servidor.

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)

Freescout — Freescout

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-27636",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-27636",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-02-25T15:25:18.635184Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "freescout-help-desk",
          "product": "freescout",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.8.206"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-02-25T04:16:03.933",
  "references": [
    {
      "url": "https://github.com/freescout-help-desk/freescout/commit/9984071e6f1b4e633fdcffcea82bbebc9c1e009c",
      "tags": [
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-6gcm-v8xf-j9v9",
      "tags": [
        "Not Applicable"
      ],
      "source": "security-advisories@github.com"
    },
    {
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-6gcm-v8xf-j9v9",
      "tags": [
        "Not Applicable"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    },
    {
      "url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-mw88-x7j3-74vc",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-434"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.206, FreeScout's file upload restriction list in `app/Misc/Helper.php` does not include `.htaccess` or `.user.ini` files. On Apache servers with `AllowOverride All` (a common configuration), an authenticated user can upload a `.htaccess` file to redefine how files are processed, enabling Remote Code Execution. This vulnerability can be exploited on its own or in combination with CVE-2026-27637. Version 1.8.206 fixes both vulnerabilities."
    },
    {
      "lang": "es",
      "value": "FreeScout es un servicio de asistencia técnica gratuito y un buzón compartido creado con el marco Laravel de PHP. Antes de la versión 1.8.206, la lista de restricción de carga de archivos de FreeScout en 'app/Misc/Helper.php' no incluye archivos '.htaccess' o '.user.ini'. En servidores Apache con 'AllowOverride All' (una configuración común), un usuario autenticado puede cargar un archivo '.htaccess' para redefinir cómo se procesan los archivos, habilitando la Ejecución Remota de Código. Esta vulnerabilidad puede ser explotada por sí misma o en combinación con CVE-2026-27637. La versión 1.8.206 corrige ambas vulnerabilidades."
    }
  ],
  "lastModified": "2026-06-17T10:27:25.980",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:freescout:freescout:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "79CA8F5D-FF18-4F10-A6AF-3DBED9542088",
              "versionEndExcluding": "1.8.206"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}