Auth bypass in Lin-Snow Ech0
CVE-2026-79666
Ech0 before 4.4.3 fails to enforce administrator authorization on dashboard log endpoints, allowing any authenticated user to access system logs. Attackers with valid user sessions can query GET /api/system/logs and subscribe to SSE and WebSocket log streams to retrieve sensitive operational data including file paths, stack traces, and internal URLs.
Vulnerability class: Broken Access Control
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-79666?
- CVE-2026-79666 is a medium-severity vulnerability in Lin-Snow Ech0, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-08-25.
- How severe is CVE-2026-79666?
- Medium severity. CVSS v3 base score is 6.5 out of 10.