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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (10.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.4% 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: 0.002 · change: +0.000
Affected products
Weakness classification (CWE)
References
- github.com/lin-snow/Ech0/security/advisories/GHSA-w8jj-cwmc-wgq2 (vendor-advisory)
- www.vulncheck.com/advisories/ech0-before-missing-authorization-on-system-logs (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.