Security advisory

{
  "id": "0ed6460e1a7c8377cb94cc6075f8f76b1fdbd234c9714bfac91ab6dfbc488b6a",
  "url": "https://osv.dev/vulnerability/CVE-2020-28645",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-28645",
    "summary": "Deleting users with certain names caused system files to be deleted. Risk is higher for systems which allow users to register themselves and have the data directory in the web root. This affects ownCloud/core versions < 10.6.",
    "evidence": "osv:CVE-2020-28645",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2020-28645",
      "aliases": [
        "CVE-2020-28645"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/owncloud/core",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "94282d9471e5c786602af512e7207aed6b6e3f8f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:owncloud:owncloud:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "10.6.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v10.6.0RC3",
            "v10.6.0RC2",
            "v10.6.0RC1",
            "v10.6.0beta1",
            "v10.3.0alpha",
            "v10.3.0alpha2",
            "v10.1.0",
            "v10.1.0RC2",
            "v10.1.0RC1",
            "v10.1.0beta",
            "v10.0.10",
            "v10.0.10RC4",
            "v10.0.10RC3",
            "v10.0.10RC2",
            "v10.0.10RC1",
            "v10.0.9",
            "v10.0.9RC4",
            "v10.0.9RC3",
            "v10.0.9RC2",
            "v10.0.9RC1",
            "v10.0.9beta",
            "v10.0.8",
            "v10.0.8RC4",
            "v10.0.8RC3",
            "v10.0.8RC2",
            "v10.0.8RC1",
            "v10.0.5",
            "v10.0.5RC4",
            "v10.0.5RC3",
            "v10.0.5RC2",
            "v10.0.5RC1",
            "v10.0.4",
            "v10.0.4RC2",
            "v10.0.4RC1",
            "v10.0.4beta2",
            "v10.0.4beta1",
            "v10.0.3",
            "v10.0.3RC1",
            "v10.0.3beta2",
            "v10.0.3beta",
            "v10.0.2",
            "v10.0.2RC1",
            "v10.0.1",
            "v10.0.1RC5",
            "v10.0.1RC4",
            "v10.0.1RC3",
            "v10.0.1RC2",
            "v10.0.1RC1",
            "v10.0.0",
            "v10.0.0RC5",
            "v10.0.0RC4",
            "v10.0.0RC3",
            "v10.0.0RC2",
            "v10.0.0RC1",
            "v10.0beta2",
            "v10.0.0beta2",
            "v10.0.0beta",
            "v10.0.0alpha",
            "v9.1.0RC1",
            "v9.1.0beta2",
            "v9.0.1beta2",
            "v9.1.0beta1",
            "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-2020-28645.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:43.826081556Z",
      "provider": "osv",
      "references": [
        "https://owncloud.com/security-advisories/missing-user-validation-leading-to-information-disclosure/"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:owncloud:owncloud:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "owncloud:owncloud",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "10.6.0"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-28645",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 435715,
  "published_at": "2021-02-09T19:15:13.697+00:00"
}