Security advisory

{
  "id": "863d6c123c65977ffa338e785f84844c564e424f0e132877c8ad1794c052290d",
  "url": "https://osv.dev/vulnerability/CVE-2016-9464",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2016-9464",
    "summary": "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.",
    "evidence": "osv:CVE-2016-9464",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2016-9464",
      "aliases": [
        "CVE-2016-9464"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nextcloud/server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "36750094f8b1a2f3bb24ac46348a639fc6197f9c"
                },
                {
                  "introduced": "df5a1e2a30e9f2bac00522b3e99482d4c9544f22"
                },
                {
                  "last_affected": "df5a1e2a30e9f2bac00522b3e99482d4c9544f22"
                },
                {
                  "fixed": "3387e5d00fcf6b2ea6b285a091e5743f545e7202"
                },
                {
                  "fixed": "7289cb5ec0b812992ab0dfb889744b94bc0994f0"
                },
                {
                  "fixed": "a5471b4a3e3f30e99e4de39c97c0c3b3c2f1618f"
                },
                {
                  "fixed": "e2c4f4f9aa11bc92e8f2212cce73841b922187e8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "9.0.54"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:10.0:rc1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "10.0-rc1"
                      },
                      {
                        "last_affected": "10.0-rc1"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3387e5d00fcf6b2ea6b285a091e5743f545e7202"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7289cb5ec0b812992ab0dfb889744b94bc0994f0"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a5471b4a3e3f30e99e4de39c97c0c3b3c2f1618f"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e2c4f4f9aa11bc92e8f2212cce73841b922187e8"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "10.0-rc1",
            "v9.0.54RC1",
            "v10.0RC1",
            "v9.0.52",
            "v9.0.52RC1",
            "v9.0.51",
            "v9.0.50",
            "v9.1.0beta1",
            "v9.0.2",
            "v9.0.2RC2",
            "v9.0.2RC1",
            "v9.0.1RC2",
            "v9.0.1",
            "v9.0.1RC1",
            "v9.0.1beta",
            "v9.0.0",
            "v9.0.0RC3",
            "v9.0.0RC2",
            "v9.0.0RC1",
            "v9.0.0beta2",
            "v9.0beta1",
            "v8.2RC1",
            "v8.2beta1",
            "v8.1RC2",
            "v8.1.0beta2",
            "v8.1.0beta1",
            "v8.1.0alpha2",
            "v8.1.0alpha1",
            "v8.0.0",
            "v8.0.0RC2",
            "v8.0.0RC1",
            "v8.0.0beta2",
            "v8.0.0beta1",
            "v8.0.0alpha2",
            "v8.0.0alpha1",
            "v7.0.0beta1",
            "v7.0.0alpha2",
            "v6.0.0RC2",
            "v6.0.0RC1",
            "v6.0.0beta5",
            "v6.0.0beta4",
            "v6.0.0beta3",
            "v6.0.0beta2",
            "v6.0.0alpha2",
            "v5.0.0",
            "v5.0.0RC3",
            "v5.0.0RC2",
            "v5.0.0RC1",
            "v5.0.0beta2",
            "v5.0.0beta1",
            "v5.0.0alpha1",
            "v4.5.0",
            "v4.5.0RC3",
            "v4.5.0RC2",
            "v4.5.0RC1",
            "v4.5.0beta4",
            "v4.5.0beta3",
            "v4.0.6",
            "v4.0.5",
            "v4.0.4",
            "v4.0.1",
            "v4.0.0",
            "v4.0.0RC2",
            "v4.0.0RC",
            "v4.0.0beta",
            "v3.0",
            "v1.0.0beta1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-9464.json"
          }
        }
      ],
      "modified": "2026-10-20T10:48:48.171770085Z",
      "provider": "osv",
      "references": [
        "https://github.com/nextcloud/server/commit/3387e5d00fcf6b2ea6b285a091e5743f545e7202",
        "https://github.com/nextcloud/server/commit/7289cb5ec0b812992ab0dfb889744b94bc0994f0",
        "https://github.com/nextcloud/server/commit/a5471b4a3e3f30e99e4de39c97c0c3b3c2f1618f",
        "https://github.com/nextcloud/server/commit/e2c4f4f9aa11bc92e8f2212cce73841b922187e8",
        "https://nextcloud.com/security/advisory/?id=nc-sa-2016-007",
        "https://hackerone.com/reports/153905"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2016-9464",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 380352,
  "published_at": "2017-03-28T02:59:00.997+00:00"
}