CVE-2026-52838

{
  "id": "CVE-2026-52838",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-14T16:17:00.410",
  "lastModified": "2026-10-24T21:10:00.130",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Easy!Appointments is a self hosted appointment scheduler. Versions prior to 1.6.0 allow administrators to define a custom \"booking disabled\" message through the booking settings page. That value is stored in the `disable_booking_message` setting via a rich-text editor and later passed directly to the public `booking_message` view without escaping or sanitization. An authenticated administrator can store HTML or JavaScript in this field, enable disabled-booking mode, and trigger stored XSS in every unauthenticated visitor who opens the public booking page. Version 1.6.0 fixes the issue."
    },
    {
      "lang": "es",
      "value": "Easy!Appointments es un programador de citas autoalojado. Las versiones anteriores a la 1.6.0 permiten a los administradores definir un mensaje personalizado de ’reserva deshabilitada’ a través de la página de configuración de reservas. Ese valor se almacena en la configuración “disable_booking_message” a través de un editor de texto enriquecido y luego se pasa directamente a la vista pública “booking_message” sin escape ni saneamiento. Un administrador autenticado puede almacenar HTML o JavaScript en este campo, habilitar el modo de reserva deshabilitada y desencadenar XSS almacenado en cada visitante no autenticado que abre la página pública de reservas. La versión 1.6.0 corrige el problema."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "alextselegidis",
          "product": "easyappointments",
          "versions": [
            {
              "version": "< 1.6.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:N/I:L/A:N",
          "baseScore": 2.6,
          "baseSeverity": "LOW",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "HIGH",
          "userInteraction": "REQUIRED",
          "scope": "CHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 1.4
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-14T15:59:57.528356Z",
          "id": "CVE-2026-52838",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/alextselegidis/easyappointments/commit/629a0415f54f75556c17f4f5d9c77fda1fdbdeae",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-996f-334j-67g7",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-996f-334j-67g7",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}