CVE-2026-33638 json
Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint
published 2026-03-24 7 mo ago modified 2026-06-17 4 mo ago also GHSA-m983-7426-5hrj , GO-2026-4838 , EUVD-2026-16413
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 43%
- public exploits
- 0
- none known
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.
Patch / fix
- go github.com/lin-snow/ech0 1.4.8-0.20260322121226-acbf1fd71011
- ech0 ech0 4.2.0
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260326T203309-150000.1.155.2
suse advisories SUSE-SU-2026:1135-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/lin-snow/ech0 | <1.4.8-0.20260322121226-acbf1fd71011 |
1.4.8-0.20260322121226-acbf1fd71011 |
Affected products
- lin-snow Ech0
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
github.com
/lin-snow/Ech0/commit/acbf1fd71011e6b9e1e6a911128056a19862f681
web, patch
-
github.com
/lin-snow/Ech0/security/advisories/GHSA-m983-7426-5hrj
web, vendor-advisory, advisory
-
github.com
/lin-snow/Ech0/releases/tag/v4.2.0
web, product, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-33638
advisory
-
github.com
/lin-snow/Ech0
package
Sources
- CVE List CVE-2026-33638
- GitHub Advisory GHSA-m983-7426-5hrj
- NVD CVE-2026-33638
- OSV GO-2026-4838
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