VulnerabilityAnalyzed

CVE-2026-33638

This allows remote unauthenticated user enumeration and exposure of user profile metadata.

MEDIUM 5.3EPSS 0.48%

Does this matter?

Lower severity and a low EPSS score (0.48%). Track it; it rarely justifies an emergency change on its own.

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: 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS: 0.48% probability · 40th percentile
CISA KEV: Not listed
Weakness: CWE-862
Affected: ech0/ech0
Source: security-advisories@github.com

References

https://github.com/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681Patch
https://github.com/lin-snow/Ech0/releases/tag/v4.2.0Product, Release Notes
https://github.com/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrjVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.