CVE-2026-52841

{
  "id": "CVE-2026-52841",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-14T16:17:00.800",
  "lastModified": "2026-10-24T21:10:00.130",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, `Google::oauth` at `application/controllers/Google.php:278` stores its URL-supplied `provider_id` in the session, and `oauth_callback` saves the issued Google OAuth token against that row without checking the caller owns the provider. Any logged-in backend user (admin, provider, or secretary) rebinds a peer provider's Google sync to a Google account they control. The peer's appointments then sync into the attacker's calendar with each customer's name and email attached as attendee data. Version 1.6.0 patches the issue."
    },
    {
      "lang": "es",
      "value": "Easy!Appointments es un programador de citas autoalojado. En versiones anteriores a la 1.6.0, Google::oauth en application/controllers/Google.php:278 almacena su provider_id suministrado por URL en la sesión, y oauth_callback guarda el token de Google OAuth emitido contra esa fila sin verificar que el llamador posee el proveedor. Cualquier usuario de backend con sesión iniciada (administrador, proveedor o secretario) reasigna la sincronización de Google de un proveedor par a una cuenta de Google que controlan. Las citas del par luego se sincronizan en el calendario del atacante con el nombre y correo electrónico de cada cliente adjuntos como datos de asistente. 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:U/C:L/I:L/A:N",
          "baseScore": 3.1,
          "baseSeverity": "LOW",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "HIGH",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 0.5,
        "impactScore": 2.5
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-14T15:45:35.488362Z",
          "id": "CVE-2026-52841",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/alextselegidis/easyappointments/commit/4b2d245d2cd2058dc76e05f6eb65b26699268471",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-8hm4-r66f-29wr",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/alextselegidis/easyappointments/security/advisories/GHSA-8hm4-r66f-29wr",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}