{"id":"CVE-2026-33638","aliases":["GHSA-m983-7426-5hrj","GO-2026-4838"],"url":"https://o3.security/vulnerability/CVE-2026-33638","summary":"Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint","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.","published":"2026-03-26T20:52:40.464Z","modified":"2026-08-12T03:51:10.041872132Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/lin-snow/ech0","fixedVersion":"1.4.8-0.20260322121226-acbf1fd71011"}],"fix":{"url":"https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681","label":"lin-snow/Ech0@acbf1fd"},"references":[{"type":"WEB","url":"https://github.com/lin-snow/Ech0/releases/tag/v4.2.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33638.json"},{"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"},{"type":"FIX","url":"https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:10.041872132Z"}}