FKIE_CVE-2026-52839

Vulnerability from fkie_nvd - Published: 2026-07-14 16:17 - Updated: 2026-10-24 21:10
Severity
3.3 (Low) - CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N
Summary
Easy!Appointments is a self hosted appointment scheduler. Versions prior to 1.6.0 correctly filter provider-scoped appointments in the `appointments/search` response, proving that provider isolation is an intended security boundary. However, the direct mutation endpoints `appointments/store` and `appointments/update` only check generic appointment privileges and never verify that the submitted `id_users_provider` belongs to the current session. A normal authenticated provider can inject new appointments into another provider's schedule via `store`, or reassign existing appointments into a foreign provider's calendar via `update`. The `store` path contains an additional write-before-crash bug: the unauthorized row is committed to the database before the controller crashes on a type error, so the attacker receives an error response while the foreign appointment is already persisted. Version 1.6.0 patches the issue.
References
security-advisories@github.comhttps://github.com/alextselegidis/easyappointments/commit/725eafa647308846ce887657db12771a829e42ef
security-advisories@github.comhttps://github.com/alextselegidis/easyappointments/security/advisories/GHSA-w8xc-8g92-v77h
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-w8xc-8g92-v77h
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "easyappointments",
          "vendor": "alextselegidis",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.6.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Easy!Appointments is a self hosted appointment scheduler. Versions prior to 1.6.0 correctly filter provider-scoped appointments in the `appointments/search` response, proving that provider isolation is an intended security boundary. However, the direct mutation endpoints `appointments/store` and `appointments/update` only check generic appointment privileges and never verify that the submitted `id_users_provider` belongs to the current session. A normal authenticated provider can inject new appointments into another provider\u0027s schedule via `store`, or reassign existing appointments into a foreign provider\u0027s calendar via `update`. The `store` path contains an additional write-before-crash bug: the unauthorized row is committed to the database before the controller crashes on a type error, so the attacker receives an error response while the foreign appointment is already persisted. Version 1.6.0 patches the issue."
    },
    {
      "lang": "es",
      "value": "Easy!Appointments es un programador de citas autohospedado. Las versiones anteriores a la 1.6.0 filtran correctamente las citas con \u00e1mbito de proveedor en la respuesta de appointments/search, lo que demuestra que el aislamiento de proveedores es un l\u00edmite de seguridad intencionado. Sin embargo, los puntos finales de mutaci\u00f3n directa appointments/store y appointments/update solo verifican privilegios gen\u00e9ricos de citas y nunca comprueban que el id_users_provider enviado pertenezca a la sesi\u00f3n actual. Un proveedor autenticado normal puede inyectar nuevas citas en la agenda de otro proveedor a trav\u00e9s de store, o reasignar citas existentes al calendario de un proveedor externo a trav\u00e9s de update. La ruta store contiene un error adicional de escritura antes de la ca\u00edda (write-before-crash): la fila no autorizada se confirma en la base de datos antes de que el controlador falle por un error de tipo, por lo que el atacante recibe una respuesta de error mientras la cita externa ya est\u00e1 persistida. La versi\u00f3n 1.6.0 corrige el problema."
    }
  ],
  "id": "CVE-2026-52839",
  "lastModified": "2026-10-24T21:10:00.130",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 3.3,
          "baseSeverity": "LOW",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 0.7,
        "impactScore": 2.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-52839",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-15T14:48:44.724792Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-14T16:17:00.540",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/alextselegidis/easyappointments/commit/725eafa647308846ce887657db12771a829e42ef"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-w8xc-8g92-v77h"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-w8xc-8g92-v77h"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        },
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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