Security advisory

{
  "id": "e8f51b8067e7547a58e876e169295e158f863f6720d6e26f24d9556bdc5efb8c",
  "url": "https://osv.dev/vulnerability/CVE-2020-8223",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-8223",
    "summary": "A logic error in Nextcloud Server 19.0.0 caused a privilege escalation allowing malicious users to reshare with higher permissions than they got assigned themselves.",
    "evidence": "osv:CVE-2020-8223",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-8223",
      "aliases": [
        "CVE-2020-8223"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nextcloud/server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9c63433cde916cd35b0708b398910cbc1cb52315"
                },
                {
                  "last_affected": "9c63433cde916cd35b0708b398910cbc1cb52315"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:19.0.0:-:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "19.0.0-NA"
                      },
                      {
                        "last_affected": "19.0.0-NA"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "19.0.0-NA",
            "v19.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8223.json"
          }
        }
      ],
      "modified": "2026-10-24T10:31:00.360489840Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KC6HLX5SG4PZO6Y54D2LFJ4ATG76BKOP/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T7FX3O6SJE2S52I2HAA4DSTUIISP5BNA/",
        "https://nextcloud.com/security/advisory/?id=NC-SA-2020-029",
        "https://hackerone.com/reports/889243"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "32"
                  },
                  {
                    "last_affected": "32"
                  },
                  {
                    "introduced": "33"
                  },
                  {
                    "last_affected": "33"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-8223",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 439521,
  "published_at": "2020-10-05T14:15:13.623+00:00"
}