{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.2.0"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7f236aed761da27f971ad289c4a26af0d9eb3e92"
            }
          ],
          "repo": "https://github.com/lin-snow/ech0",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-m983-7426-5hrj"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33638.json"
  },
  "details": "Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to version 4.2.0, `GET /api/allusers` is mounted as a public endpoint and returns user records without authentication. This allows remote unauthenticated user enumeration and exposure of user profile metadata. A fix is available in v4.2.0.",
  "id": "CVE-2026-33638",
  "modified": "2026-04-01T23:08:09.242137972Z",
  "published": "2026-03-26T20:52:40.464Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33638.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lin-snow/Ech0/releases/tag/v4.2.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33638"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint"
}