CVE-2026-79673: Ech0 before 4.4.3 Scope Bypass via profile:read Token

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-25 · updated 2026-08-31
Weakness: CWE-863

Description

Ech0 before 4.4.3 protects the PUT /user endpoint with the profile:read scope, a read-only scope, but allows write operations including password changes. An attacker with an admin's profile:read access token can change the admin's password and login to obtain an unrestricted session token that bypasses all scope enforcement.

Affected products

lin-snow Ech0: before 4.4.3 — fixed in 4.4.3

How to fix

Upgrade to a fixed version: lin-snow Ech0 4.4.3. Check the vendor advisory for mitigations.

References

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

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