{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "051e46a7a272300cf7c90b3e330fd1501fd6a996"
            },
            {
              "fixed": "ca86133382c6efb7c0eb82e5b9806a84bad2b9dc"
            }
          ],
          "repo": "https://github.com/nextcloud/server",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-hq6c-r898-fgf2"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-639"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66547.json"
  },
  "details": "Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1.",
  "id": "CVE-2025-66547",
  "modified": "2026-04-01T23:09:39.466694584Z",
  "published": "2025-12-05T16:32:17.359Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3040887"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66547.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66547"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nextcloud/server/issues/51247"
    },
    {
      "type": "FIX",
      "url": "https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9"
    },
    {
      "type": "FIX",
      "url": "https://github.com/nextcloud/server/pull/51288"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Nextcloud Server users can modify tags on files that do not belong to them"
}