CVE-2026-48071

{
  "id": "CVE-2026-48071",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-06T22:17:09.680",
  "lastModified": "2026-10-23T21:10:00.157",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 1.0.4, the PIN-type challenge throttle uses `emailHash` as the only key. The throttle rows live in the central `challenge_throttle` table, which is shared across all tenants. Every tenant's `/api/tenants/{id}/appointments/verify-challenge` endpoint increments the same row when a PIN response fails, and every tenant's `/api/tenants/{id}/appointments/challenge` endpoint reads the same row when deciding whether to issue a new challenge. When the same `emailHash` exists in multiple tenants on the same OpenReception instance (the same patient holding tunnels in two different clinics that share the platform), an attacker who knows the patient's email can lock out that patient on tenant B by issuing failed challenge responses against tenant A. The attacker needs no relationship to tenant B; the lockout propagates through the shared throttle row. The lockout escalates with repeated failures. The first lockout triggers at 4 failed attempts and lasts approximately 60 seconds. Subsequent failures escalate the lockout duration to 5 minutes, 30 minutes, and 60 minutes per the throttle service's escalation logic. Repeated bursts produce sustained denial of service against the targeted email. Version 1.0.4 patches the issue."
    },
    {
      "lang": "es",
      "value": "El software de reserva de citas de OpenReception proporciona una plataforma de reserva de citas cifrada de extremo a extremo. Antes de la versión 1.0.4, el limitador de desafíos de tipo PIN utiliza ’emailHash’ como la única clave. Las filas del limitador residen en la tabla central ’challenge_throttle’, que es compartida por todos los inquilinos. El endpoint ’/api/tenants/{id}/appointments/verify-challenge’ de cada inquilino incrementa la misma fila cuando falla una respuesta PIN, y el endpoint ’/api/tenants/{id}/appointments/challenge’ de cada inquilino lee la misma fila al decidir si emitir un nuevo desafío. Cuando el mismo ’emailHash’ existe en múltiples inquilinos en la misma instancia de OpenReception (el mismo paciente con túneles en dos clínicas diferentes que comparten la plataforma), un atacante que conoce el correo electrónico del paciente puede bloquear a ese paciente en el inquilino B al emitir respuestas de desafío fallidas contra el inquilino A. El atacante no necesita ninguna relación con el inquilino B; el bloqueo se propaga a través de la fila compartida del limitador. El bloqueo se intensifica con fallos repetidos. El primer bloqueo se activa con 4 intentos fallidos y dura aproximadamente 60 segundos. Fallos posteriores aumentan la duración del bloqueo a 5 minutos, 30 minutos y 60 minutos según la lógica de escalada del servicio de limitación. Ráfagas repetidas producen una denegación de servicio sostenida contra el correo electrónico objetivo. La versión 1.0.4 corrige el problema."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "open-reception",
          "product": "appointment-booking-software",
          "versions": [
            {
              "version": "< 1.0.4",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
          "baseScore": 5.8,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-08T02:25:43.741761Z",
          "id": "CVE-2026-48071",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-307"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/open-reception/appointment-booking-software/commit/828b5297dc4c9827f7a43841d0f839c21462185d",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-f778-wf9x-3qf9",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-f778-wf9x-3qf9",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}