{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "1.14.0"
              },
              {
                "fixed": "1.14.6"
              },
              {
                "introduced": "1.15.0"
              },
              {
                "fixed": "1.15.2"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "b490633a3d240ef4a8d6b8cf7b56836d9768a5ab"
            },
            {
              "fixed": "9f6d33e3374fed6bdd1704e5b551376db549acec"
            },
            {
              "introduced": "4059042a9cd641399c68edd15c0bce544f774c95"
            },
            {
              "fixed": "dbdfe16e9fcc22fd86f970051e93075d540d2017"
            },
            {
              "fixed": "f1da8b30a455f02373d44154da04494c949a95ae"
            }
          ],
          "repo": "https://github.com/nextcloud/deck",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-wwr8-hx9g-rjvv"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-284"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66557.json"
  },
  "details": "Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.14.6 and 1.15.2, a bug in the permission logic allowed users with \"Can share\" permission to modify the permissions of other recipients. This vulnerability is fixed in 1.14.6 and 1.15.2.",
  "id": "CVE-2025-66557",
  "modified": "2026-07-15T01:49:17.986938661Z",
  "published": "2025-12-05T17:28:48.642Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3247499"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66557.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-wwr8-hx9g-rjvv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66557"
    },
    {
      "type": "FIX",
      "url": "https://github.com/nextcloud/deck/commit/f1da8b30a455f02373d44154da04494c949a95ae"
    },
    {
      "type": "FIX",
      "url": "https://github.com/nextcloud/deck/pull/7131"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Nextcloud Deck app allowed user with \"Can share\" permission to modify permissions of other non-owners"
}