CVE-2026-44177

{
  "id": "CVE-2026-44177",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-16T22:17:02.103",
  "lastModified": "2026-10-24T20:10:00.137",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Kirby is an open-source content management system. In versions 5.3.0 and above but prior to 5.4.1, Kirby did not correctly validate the provided user ID, resulting in a path traversal vulnerability. Version 5.3.0 introduced a performance improvement to the Users collection that loaded user objects lazily when first needed. Users were queried by their ID, which was then used to locate the corresponding account directory under site/accounts. This affected the authentication API (accessible to unauthenticated requests), the users API (accessible only to authenticated users), and any other place that uses $users->find() to look up an individual user by a request-provided email or ID. As a result, an attacker could trigger arbitrary PHP file inclusion of files named  index.php (for example, the main PHP files of plugins), the impact of which depends on the logic those files contain. It also allowed probing for the existence of arbitrary directories on the server, letting attackers fingerprint the server and site setup, including installed plugins and the content structure. This issue has been fixed in version 5.4.1."
    },
    {
      "lang": "es",
      "value": "Kirby es un sistema de gestión de contenido de código abierto. En las versiones 5.3.0 y superiores, pero anteriores a la 5.4.1, Kirby no validaba correctamente el ID de usuario proporcionado, lo que resultaba en una vulnerabilidad de salto de ruta. La versión 5.3.0 introdujo una mejora de rendimiento en la colección de Usuarios que cargaba los objetos de usuario de forma perezosa cuando se necesitaban por primera vez. Los usuarios eran consultados por su ID, que luego se utilizaba para localizar el directorio de cuenta correspondiente bajo site/accounts. Esto afectó a la API de autenticación (accesible a solicitudes no autenticadas), la API de usuarios (accesible solo a usuarios autenticados), y cualquier otro lugar que utilice $users  ->  find() para buscar un usuario individual por un correo electrónico o ID proporcionado en la solicitud. Como resultado, un atacante podría desencadenar la inclusión de ficheros PHP arbitrarios llamados index.php (por ejemplo, los ficheros PHP principales de los plugins), cuyo impacto depende de la lógica que contengan esos ficheros. También permitía sondear la existencia de directorios arbitrarios en el servidor, permitiendo a los atacantes identificar la configuración del servidor y del sitio, incluyendo los plugins instalados y la estructura de contenido. Este problema ha sido solucionado en la versión 5.4.1."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "getkirby",
          "product": "kirby",
          "versions": [
            {
              "version": ">= 5.3.0, < 5.4.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "LOW",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-17T13:43:32.857508Z",
          "id": "CVE-2026-44177",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-98"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/getkirby/kirby/releases/tag/5.4.1",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/getkirby/kirby/security/advisories/GHSA-9hx7-c53c-v6x8",
      "source": "[email protected]"
    }
  ]
}