Nextcloud download permissions can be changed by resharer

{
  "id": "13c8b91a73f57ad6ef992a0c43b97ebb5408ba3697622987597f2353680081a1",
  "url": "https://osv.dev/vulnerability/CVE-2023-25821",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Nextcloud download permissions can be changed by resharer",
    "summary": "Nextcloud is an Open Source private cloud software. Versions 24.0.4 and above, prior to 24.0.7, and 25.0.0 and above, prior to 25.0.1, contain Improper Access Control. Secure view for internal shares can be circumvented if reshare permissions are also given. This issue is patched in versions 24.0.7 and 25.0.1. No workaround is available.",
    "evidence": "osv:CVE-2023-25821",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-25821",
      "aliases": [
        "CVE-2023-25821",
        "GHSA-7w6h-5qgw-4j94"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nextcloud/server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "fb9510ffed32c92dee60285157a69f09a10fe468"
                },
                {
                  "fixed": "7f47000def372cc90705cdb45fe1acb78ebdc27f"
                },
                {
                  "introduced": "20ea9a25353129b56d46951fe7d23939665ab2b2"
                },
                {
                  "last_affected": "20ea9a25353129b56d46951fe7d23939665ab2b2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "24.0.4"
                      },
                      {
                        "fixed": "24.0.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "24.0.4"
                      },
                      {
                        "fixed": "24.0.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:25.0.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "25.0.0"
                      },
                      {
                        "last_affected": "25.0.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:25.0.0:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "25.0.0"
                      },
                      {
                        "last_affected": "25.0.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "25.0.0",
            "v24.0.7rc1",
            "v25.0.0",
            "v24.0.6",
            "v24.0.6rc1",
            "v24.0.5",
            "v24.0.5rc1",
            "v24.0.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-25821.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.291284353Z",
      "provider": "osv",
      "references": [
        "https://hackerone.com/reports/1724016",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/25xxx/CVE-2023-25821.json",
        "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7w6h-5qgw-4j94",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-25821",
        "https://github.com/nextcloud/server/pull/34502"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-284"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/25xxx/CVE-2023-25821.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-25821",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504674,
  "published_at": "2023-02-24T23:39:51.684+00:00"
}