Vulnerability · Published Aug 25, 2026 · Assigned by VulnCheck

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

Medium 6.5

In plain English

A medium-severity incorrect authorization in Ech0 from lin-snow. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 62.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/lin-snow/ech0	4.4.3	GHSA-hm2h-wwwh-g49x
Go	github.com/lin-snow/ech0	no fix listed	GO-2026-5431

Affected products (as reported)

Vendor	Product	Versions
lin-snow	Ech0	0 – before 4.4.3

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

References

GitHub Security Advisory (GHSA-hm2h-wwwh-g49x) vendor-advisory
VulnCheck Advisory: Ech0 before 4.4.3 Scope Bypass via profile:read Token third-party-advisory