Medium
Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-33638
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 05:39 UTC · Revision 1
Source evidence
Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint
core-osv · Original sourcePublished 26 Mar 2026, 20:52 UTC
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.
osv:CVE-2026-33638
Complete source record
{
"id": "021f80c14901dd7e7caaa0f1ecb30613bf1e1912af8bc19125c52a73e15f1fb8",
"url": "https://osv.dev/vulnerability/CVE-2026-33638",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint",
"summary": "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.",
"evidence": "osv:CVE-2026-33638",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-33638",
"aliases": [
"CVE-2026-33638",
"GHSA-m983-7426-5hrj",
"GO-2026-4838"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/lin-snow/ech0",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "7f236aed761da27f971ad289c4a26af0d9eb3e92"
},
{
"fixed": "acbf1fd71011e6b9e1e6a911128056a19862f681"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:ech0:ech0:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "4.2.0"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "acbf1fd71011e6b9e1e6a911128056a19862f681"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "7f236aed761da27f971ad289c4a26af0d9eb3e92"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v4.2.0"
}
]
}
}
],
"versions": [
"v4.1.9",
"v4.1.8",
"v4.1.7",
"v4.1.6",
"v4.1.5",
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"v2.5.0",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33638.json"
}
}
],
"modified": "2026-10-28T02:30:26.283854953Z",
"provider": "osv",
"references": [
"https://github.com/lin-snow/Ech0/releases/tag/v4.2.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33638.json",
"https://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrj",
"https://nvd.nist.gov/vuln/detail/CVE-2026-33638",
"https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681"
],
"provider_metadata": {
"cwe_ids": [
"CWE-862"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33638.json"
}
},
"related_cves": [
{
"value": "CVE-2026-33638",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 492782,
"published_at": "2026-03-26T20:52:40.464+00:00"
}