Auth bypass in Lin-Snow Ech0
CVE-2026-79673
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/lin-snow/Ech0/security/advisories/GHSA-hm2h-wwwh-g49x (vendor-advisory)
- www.vulncheck.com/advisories/ech0-before-scope-bypass-via-profile-read-token (third-party-advisory)
Frequently asked questions
- What is CVE-2026-79673?
- CVE-2026-79673 is a medium-severity vulnerability in Lin-Snow Ech0, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-08-25.
- How severe is CVE-2026-79673?
- Medium severity. CVSS v3 base score is 6.5 out of 10.