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Vulnerability record · CVE-2026-33638 · published 26 March 2026

CVE-2026-33638: Ech0 missing authorization vulnerability

Ech0 · Ech0

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.

5.3 CVSS 3.1 Medium EPSS 0.61% · top 52.7% CWE-862 · Missing authorization
5.3CVSS 3.1 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681 Patch
https://github.com/lin-snow/Ech0/releases/tag/v4.2.0 ProductRelease Notes
https://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrj Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-33638), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.