{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "5.0.9"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "d39915697e6e0be04d02d55a46c631f53013aea6"
            }
          ],
          "repo": "https://github.com/admidio/admidio",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-g8p8-94f2-28gr"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41657.json"
  },
  "details": "Admidio is an open-source user management solution. Prior to version 5.0.9, the contacts_data.php endpoint uses a weaker permission check (isAdministratorUsers(), requiring only rol_edit_user=true) than the frontend UI (contacts.php) which correctly requires the stronger isAdministrator() (requiring rol_administrator=true) and the contacts_show_all system setting. A user manager who is not a full administrator can directly request contacts_data.php?mem_show_filter=3 to retrieve all user records across all organizations in the Admidio instance, bypassing multi-tenant organization isolation. This issue has been patched in version 5.0.9.",
  "id": "CVE-2026-41657",
  "modified": "2026-08-12T03:51:09.067754434Z",
  "published": "2026-05-07T02:58:09.340Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Admidio/admidio/releases/tag/v5.0.9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/Admidio/admidio/security/advisories/GHSA-g8p8-94f2-28gr"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41657.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41657"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Admidio: Cross-Organization Member Data Exposure via Permission Check Mismatch in contacts_data.php"
}