# CVE-2026-79673: Ech0 scope bypass in PUT /user endpoint via profile:read token

Source: https://junglewise.ai/threats/cve-2026-79673-ech0-scope-bypass-in-put-user-endpoint-via-profile-read-token  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-25. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-79673 · Severity: medium · CVSS 6.5 · Published 2026-08-25

Ech0 is an API platform that uses access tokens with granular permission scopes to control what operations different integrations can perform. A critical flaw allows an attacker with a read-only "profile:read" token to bypass scope restrictions, change an admin's password, and escalate to a fully unrestricted admin session—completely circumventing the permission system and enabling account takeover.

Technologies: [github.com/lin-snow/ech0 (Go)](https://junglewise.ai/threats/technologies/github-com-lin-snow-ech0), [Lin-Snow Ech0](https://junglewise.ai/threats/technologies/ech0). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Lin-Snow](https://junglewise.ai/threats/vendors/lin-snow).

## Quick answers

**Is CVE-2026-79673 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-79673 being exploited in the wild.

**How severe is CVE-2026-79673?** Medium severity, with a CVSS score of 6.5, published 25 August 2026.

**Which products and versions are affected?** github.com/lin-snow/ech0 (Go) SEMVER:introduced=0, SEMVER:introduced=0,fixed=4.4.3; Lin-Snow Ech0 before 4.4.3.

**Is there a fix for CVE-2026-79673?** Yes. github.com/lin-snow/ech0 (Go): upgrade to 4.4.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-79673 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-79673?** Check whether you run github.com/lin-snow/ech0 (Go) or Lin-Snow Ech0 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 4.4.3 or later

  ```sh
  go get github.com/lin-snow/ech0@v4.4.3
  ```


## Technical details

This is an authorization bypass (CWE-863) stemming from incorrect scope enforcement on the PUT /user endpoint. The endpoint is protected only by RequireScopes("profile:read"), a read-only scope, yet performs privileged write operations including password changes. The vulnerable code path: UpdateUser() accepts password changes without verifying write-level scope sufficiency; the scope middleware bypasses all checks for session tokens; after password change, POST /login issues an unrestricted session token that bypasses all subsequent scope enforcement. An attacker with an admin's profile:read access token (e.g., from compromised integration or log leak) can: (1) call PUT /user to change the admin's password, (2) login with new credentials to obtain a session token, (3) use the session token for unrestricted admin API access. Patch released in version 4.4.3 adds a profile:write scope and requires it for the PUT /user endpoint.

## Affected products

- lin-snow Ech0 before 4.4.3

## Identifiers

- CVE-2026-79673
- GHSA-hm2h-wwwh-g49x
- GO-2026-5431

## Timeline

- 2026-04-09: disclosed
- 2026-08-25: advisory
- 2026-04-09: patched: Version 4.4.3 released

## References

- [https://github.com/lin-snow/Ech0/security/advisories/GHSA-hm2h-wwwh-g49x](https://github.com/lin-snow/Ech0/security/advisories/GHSA-hm2h-wwwh-g49x)
- [https://www.vulncheck.com/advisories/ech0-before-scope-bypass-via-profile-read-token](https://www.vulncheck.com/advisories/ech0-before-scope-bypass-via-profile-read-token)

## Related threats

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- [Ech0 stored cross-site scripting in file upload](https://junglewise.ai/threats/cve-2026-79670-ech0-stored-cross-site-scripting-in-file-upload)
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