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CVE-2016-9464

Estado: ModificadaMedia (4.3)—

Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on removing shares. The Sharing Backend as implemented in Nextcloud does differentiate between shares to users and groups. In case of a received group share, users should be able to unshare the file to themselves but not to the whole group. The previous API implementation simply unshared the file to all users in the group.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Nextcloud — Nextcloud Server

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2016-9464",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 4.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "support@hackerone.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "Nextcloud Server Nextcloud Server before 9.0.54 and 10.0.0",
          "versions": [
            {
              "status": "affected",
              "version": "Nextcloud Server Nextcloud Server before 9.0.54 and 10.0.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2017-03-28T02:59:00.997",
  "references": [
    {
      "url": "http://www.securityfocus.com/bid/97287",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
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      "source": "support@hackerone.com"
    },
    {
      "url": "https://github.com/nextcloud/server/commit/3387e5d00fcf6b2ea6b285a091e5743f545e7202",
      "tags": [
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    },
    {
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        "Patch",
        "Third Party Advisory"
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      "source": "support@hackerone.com"
    },
    {
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    },
    {
      "url": "https://hackerone.com/reports/153905",
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      "source": "support@hackerone.com"
    },
    {
      "url": "https://nextcloud.com/security/advisory/?id=nc-sa-2016-007",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "support@hackerone.com"
    },
    {
      "url": "http://www.securityfocus.com/bid/97287",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/nextcloud/server/commit/3387e5d00fcf6b2ea6b285a091e5743f545e7202",
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    {
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        "Third Party Advisory"
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    },
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        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://nextcloud.com/security/advisory/?id=nc-sa-2016-007",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "support@hackerone.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-285"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-285"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on removing shares. The Sharing Backend as implemented in Nextcloud does differentiate between shares to users and groups. In case of a received group share, users should be able to unshare the file to themselves but not to the whole group. The previous API implementation simply unshared the file to all users in the group."
    },
    {
      "lang": "es",
      "value": "Nextcloud Server en versiones anteriores a 9.0.54 y 10.0.0 sufre de una verificación de autorización incorrecta de los recursos eliminados. El Sharing Backend tal como se implemento en Nextcloud diferencia los compartidos entre usuarios y grupos. En caso de una couta de grupo recibida, los usuarios deben ser capaces de no compartir los archivos con ellos mismos pero no a todo el grupo. La implementación anterior de la API simplemente no compartió el archivo a todos los uusarios en el grupo."
    }
  ],
  "lastModified": "2026-06-17T00:56:07.270",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
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              "vulnerable": true,
              "matchCriteriaId": "D6E3F368-B854-430E-AB8F-496675C4E210",
              "versionEndExcluding": "9.0.54"
            },
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              "criteria": "cpe:2.3:a:nextcloud:nextcloud_server:10.0:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A11A2099-3AEC-4622-9ADE-085740EE67C7"
            }
          ],
          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "support@hackerone.com"
}