Auth bypass in Lin-Snow Ech0
CVE-2026-79669
Ech0 before 4.4.3 lacks authorization checks on system log endpoints allowing any authenticated non-admin user to read and stream all server logs. Attackers can access historical logs and real-time log streams via GET /api/system/logs, GET /api/system/logs/stream, and WS /ws/system/logs to gather reconnaissance data including internal file paths, error stack traces, and application state.
Vulnerability class: Broken Access Control
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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-2026-79669?
- CVE-2026-79669 is a medium-severity vulnerability in Lin-Snow Ech0, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-08-25.
- How severe is CVE-2026-79669?
- Medium severity. CVSS v3 base score is 4.3 out of 10.