# CVE-2026-33638: GO-2026-4838 - Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint in github.com/lin-snow/ech0

Source: https://junglewise.ai/threats/cve-2026-33638-ech0-authenticated-user-list-exposed-data-via-public-api-allusers  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-26  
License: CC BY 4.0 with a link back

CVE-2026-33638 · Severity: low · CVSS 3.1 · Published 2026-03-26

Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint in github.com/lin-snow/ech0

Technologies: [github.com/lin-snow/ech0 (Go)](https://junglewise.ai/threats/technologies/github-com-lin-snow-ech0). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-33638 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33638 being exploited in the wild.

**How severe is CVE-2026-33638?** Low severity, with a CVSS score of 3.1, published 26 March 2026.

**Which products and versions are affected?** github.com/lin-snow/ech0 (Go) SEMVER:introduced=0,fixed=1.4.8-0.20260322121226-acbf1fd71011.

**Is there a fix for CVE-2026-33638?** Yes. github.com/lin-snow/ech0 (Go): upgrade to 1.4.8-0.20260322121226-acbf1fd71011 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-33638?** Check whether you run github.com/lin-snow/ech0 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/lin-snow/ech0 (Go): upgrade to 1.4.8-0.20260322121226-acbf1fd71011 or later

  ```sh
  go get github.com/lin-snow/ech0@v1.4.8-0.20260322121226-acbf1fd71011
  ```


## Affected products

- github.com/lin-snow/ech0 (Go) SEMVER:introduced=0,fixed=1.4.8-0.20260322121226-acbf1fd71011

## Identifiers

- CVE-2026-33638
- GHSA-m983-7426-5hrj
- GO-2026-4838

## Related threats

- [Ech0 scope bypass in PUT /user endpoint via profile:read token](https://junglewise.ai/threats/cve-2026-79673-ech0-scope-bypass-in-put-user-endpoint-via-profile-read-token)
- [Ech0 authorization bypass in comment panel endpoints](https://junglewise.ai/threats/cve-2026-79672-ech0-authorization-bypass-in-comment-panel-endpoints)
- [Ech0 server-side request forgery in webhook URL validation](https://junglewise.ai/threats/cve-2026-79671-ech0-server-side-request-forgery-in-webhook-url-validation)
- [Ech0 stored cross-site scripting in file upload](https://junglewise.ai/threats/cve-2026-79670-ech0-stored-cross-site-scripting-in-file-upload)
- [Ech0 missing authorization on system log endpoints](https://junglewise.ai/threats/cve-2026-79669-ech0-missing-authorization-on-system-log-endpoints)